I'm going to agree with Fisban when comparing full Homam to full Perle with one small typo correction: +214 Dex? I think you got a little trigger happy :). Full perle is really necessary to look at, since the set bonus is big. Enough so that it makes up for Turban by itself. So, let's consider a few other pieces.

Walahra/Haubergeon/Homam x3

Defense +116

HP +126

MP +107

Accuracy +23

Haste +14%

Enmity +3

STR +5

DEX +5

Attack +10

Perle

Defense +179

STR +22

DEX +14

VIT +10

Attack +25

Accuracy +18

Enmity +4

Haste ~~+8%~~+9%

"Critical hit rate" +2%

Set: Haste +5%

So, the big question here is +15 Attack, +17 STR, +9 DEX, +2 Crit, +1 Enmity worth giving up 126 HP, 107 MP, .5 Accuracy~~, and 1 Haste~~?

Enmity is a wash. 1 enmity won't make any difference (rounding issues) and does nothing for damage dealt, so we'll ignore it completely. You should be macroing in OTHER pieces for enmity when necessary, anyway.

+17 STR is roughly an fstr increase of 4 with a 25% chance of going up to 5. This may or may not be worth while, depending on the rank of the weapon. Consider Joyeuse. Damage 35 is a rank 3 weapon. It's lower cap is -3 and it's max cap is 11. With enough other strength gear, it's possible to force a max fSTR on our weapons. We shouldn't, as no knowledgeable DD gears with JUST STR, but it's something to consider.

Accuracy between the two sets is just about even. The +9 dex is +4.5 accuracy, giving a slight lead to the Homam/Walahra/Hauby set.

+15 attack plays ~~the same~~ a similar role as STR, but with smaller dividends. It'll help us improve our damage, but not hugely. You won't be hitting for a lot more damage over time.

+2 Crit will be barely noticeable. Most people don't notice the merits - this doesn't even provide that big of a boost.

~~The haste bonus is actually in the Hauby/Walahra/Homam mix. It's a 1% difference, but we know how effective haste is.~~The haste bonus is the same, meaning that the set with the better additional stats will win.

Honestly, the Perle set will DD a little ahead of the Mix/match set. ~~But, it gives up 1% haste to truly do so.~~ It also gives up on 126 hp and 107 mp. The MP is less of an issue - max mp only matters when you can start a fight or rest to full - but the HP is a bigger issue due to the CE blood loss. One way of looking at CE blood loss is 1800*(damage/max hp). Another way is (1800/max hp)*damage. It's easier to see this second way that dropping hp by 126 can be significant and will increase that CE drain a lot. Since CE is lost off max hp, the gear is helping you regardless of if you are at max hp or not.

My gut impression is to get both. I'll be using the Perle set on DRG, anyway, as it gets closer to 80, so I'll have the pieces. However, the match is really close. The Perle set sure looks like a VERY good WS set for Vorpals. Too bad Atonement doesn't benefit from the stats on it.

*Edited, Jul 12th 2010 9:17am by Dracoth *

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Leviathan - PLD90, BLU90, MNK 90, DRG 78