Which blade should I wield?

[NeoWizard]

In the store is a Katana of Westernesse (3d4)(+10,+10)(+2) str,dex,con.
Am wielding Longsword of Extra Attacks(2d5) (+10,+10)(+2)

I can buy the Katana if I sell the longsword, should I make the switch or am I better off keeping the longsword

Edit: forgot to mention the Katana is Westernesse.

This is from Competition 62

Here's a dump of my current char:

  [Angband 3.0.9b Character Dump]

 Name   Blade                                    Self  RB  CB  EB   Best
 Sex    Male              Age        47   STR:     16  +2  +5  +0  18/50
 Race   Dwarf             Height     48   INT:     10  -3  -2  +0      5
 Class  Warrior           Weight    159   Wis:     10  +2  -2  +0     10      9
 Title  Myrmidon          Status     43   DEX:     17  -2  +2  +0     17
 HP     300/300           Maximize    Y   CON:     16  +2  +2  +0  18/20
 SP     0/0                               CHR:     16  -3  -1  +0     12

 Level           27       Armor    [50,+30]     Saving Throw      Superb
 Cur Exp      36600       Fight     (+0,+3)     Stealth              Bad
 Max Exp      36600       Melee   (+10,+13)     Fighting          Heroic
 Adv Exp      42000       Shoot     (+9,+5)     Shooting          Heroic
 MaxDepth   1500 ft       Blows      3/turn     Disarming      Excellent
 Turns       388766       Shots      1/turn     Magic Device   Excellent
 Gold         18081       Infra       90 ft     Perception          Poor
 Burden   118.8 lbs       Speed      Normal     Searching           Fair

 You are the only child of a Dwarven Miner.  You are a credit to the
 family.  You have dark brown eyes, straight black hair, a two foot
 beard, and a dark complexion.


      abcdefghijkl@       abcdefghijkl@
 Acid:......+...... Blind:......+.....+
 Elec:......+...... Confu:......+......
 Fire:......+...... Sound:......+......
 Cold:......+...... Shard:......+......
 Pois:......+...... Nexus:......+......
 Fear:............. Nethr:......+......
 Lite:......+...... Chaos:......+......
 Dark:......+...... Disen:......+......

      abcdefghijkl@       abcdefghijkl@
S.Dig:............. Stea.:.............
Feath:............. Sear.:.............
PLite:............. Infra:....+........
Regen:............. Tunn.:.............
Telep:............. Speed:.............
Invis:..+.......... Blows:+............
FrAct:...+......... Shots:.............
HLife:............. Might:.............


  [Character Equipment]

a) a Long Sword of Extra Attacks (2d5) (+10,+10) (+2)
   It increases your attack speed by 2.  
b) a Light Crossbow (x3) (+9,+5)
c) a Ring of See Invisible
   It grants you the ability to see invisible things.  
d) a Ring of Free Action
   It grants you immunity to paralysis.  
e) an Amulet of Infravision (+4)
   It increases your infravision by 4.  
f) The Phial of Galadriel {@A1!!}
   It usually provides light of radius 3.  It cannot be harmed by the
   elements.  It might have hidden powers.
g) Power Dragon Scale Mail (-3) [40,+15]
   It provides resistance to acid, lightning, fire, cold, poison, light,
   dark, blindness, confusion, sound, shards, nexus, nether, chaos, and 
   disenchantment.  It activates for breathe the elements (300) every
   300+d300 turns.  It cannot be harmed by the elements.  
h) (nothing)
i) a Small Leather Shield [2,+4]
j) a Metal Cap [3,+7]
k) a Set of Gauntlets [2,+3]
l) a Pair of Hard Leather Boots [3] {good}


  [Character Inventory]

a) 8 Rations of Food {@E1}
b) 15 Potions of Cure Critical Wounds
c) 15 Scrolls of Phase Door
d) 5 Scrolls of Teleport Level
e) 6 Scrolls of Word of Recall {@r0}
f) 3 Scrolls of Magic Mapping
g) 5 Scrolls of Trap Detection
h) a Scroll of Door/Stair Location
i) a Scroll titled "plege thecedo"
j) a Scroll titled "pro pa"
k) 2 Rods of Trap Location {@z1!k!d!v}
l) a Rod of Door/Stair Location {@z2!k!d!v}
m) 4 Rods of Light {@z3}
n) 2 Rods of Lightning Bolts
o) a Gnomish Shovel (1d2) (+4,+3) (+2) {@w0!k!d!v}
   It increases your tunneling by 2.  
p) a Long Bow (x3) {good}
q) 12 Bolts (1d5) {@f0=g, average}


  [Home Inventory]

a) a Potion of Restore Dexterity
b) a Potion of Restore Constitution
c) 6 Scrolls of Teleportation
d) 56 Scrolls of Teleport Level
e) a Ring of Feather Falling
   It makes you fall like a feather.  
f) a Ring of Flames [+8]
   It provides resistance to fire.  It activates for fire resistance
   (20+d20 turns) and fire ball (80) every 50+d50 turns.  It cannot be
   harmed by fire.  
g) a Moonstone Ring
h) a Granite Ring
i) an Amulet of Resist Acid
   It provides resistance to acid.  It cannot be harmed by acid.  
j) a Metal Cap [3] {good}
k) a Katana (3d4) {excellent}


  [Options]

Adult: Maximize effect of race/class bonuses : yes (adult_maximize)
Adult: Randomize some of the artifacts (beta): no  (adult_randarts)
Adult: Auto-scum for good levels             : no  (adult_autoscum)
Adult: Restrict the use of stairs/recall     : no  (adult_ironman)
Adult: Restrict the use of stores/home       : no  (adult_no_stores)
Adult: Restrict creation of artifacts        : no  (adult_no_artifacts)
Adult: Don't stack objects on the floor      : no  (adult_no_stacking)
Adult: Preserve artifacts when leaving level : no  (adult_no_preserve)
Adult: Don't generate connected stairs       : yes (adult_no_stairs)
Adult: Monsters chase current location       : yes (adult_ai_sound)
Adult: Monsters chase recent locations       : yes (adult_ai_smell)
Adult: Monsters act smarter in groups        : yes (adult_ai_packs)
Adult: Monsters learn from their mistakes    : no  (adult_ai_learn)
Adult: Monsters exploit players weaknesses   : no  (adult_ai_cheat)
Adult: Monsters behave more intelligently (broken): no  (adult_ai_smart)
Score: Peek into object creation             : no  (score_peek)
Score: Peek into monster creation            : no  (score_hear)
Score: Peek into dungeon creation            : no  (score_room)
Score: Peek into something else              : no  (score_xtra)
Score: Know complete monster info            : no  (score_know)
Score: Allow player to avoid death           : no  (score_live)

[starstealer]

I would probably take the katana (though - what's the excellent katana in your home? Maybe something just as good?). Here's why:

1. With the katana, you should have 2 attack/round and since the katana has a slightly better damage advantage and the added +2 str/dex. Extra con doesn't hurt for hp as well.
2. Any damage loss from switching from 3 attacks to 2 attacks is minimized because you have three very effective slays to work with.
3. Wielding westernesse gives you both FA and SI - so you can afford to replace both of those rings - perhaps that nice ring of flames in your home...

Before spending the money though - I would find out precisely what the katana you already have does.

EDIT: This becomes a much tougher decision if you have two points more in dex or one point more in str - as that puts your long sword up to 4 blows/turn - while the katana is stuck at 2. At that point, I would probably still take the katana and hope for a good ring of damage or something similar to keep the damage up - becuase replacing those two rings is pretty useful.

[NeoWizard]

Thanks for your comment, I think I'll go for the Wseternesse in the store.

I don't have any form of id , and the only one available is a ?*id* in the black market, there is not even a _Perception in the mage store. And I don't want to scum the town for cash.

So I wont take a chance of losing it. I'll Id the one at home later. I'm betting the one at home won't be better. I'll keep you informed.

Edit: ID'd the katana at home which was only a Slay Demon (+5, +9)

[PowerDiver]

One thing you should do with any excellent weapon you need to judge is to remove your stealth items, check your stealth, wield and check whether your stealth or any stats change. That sometimes restricts the number of possible egos [e.g. wisdom bonus] or tells you outright [e.g. stealth bonus].