1 point of base stat give muche more vs a 1 point of secndary stat, and you talking like fending don have any det crit and skill speed, whe have 2 set to play and meaby because fending can have parry whe have a little less det or crit or something, i make 2 sets in ariyala
str DRK
http://ffxiv.ariyala.com/SBGL
vit DRK
http://ffxiv.ariyala.com/SJ0Q
as you can see whe have 75 point more or less of diference (i dont change the extra points so are in both in vit) and a not big dierence betwen secondaries stats, so 75 points of vit in this actual pacth, more high in 3.2 are mandatory.