Ah, I see what you mean, though actually the extra stats only really applies to PvE staves.
S3 staff - 62sta, 29res, 247dmg
Dagger + offhand - 61-65sta, 41-45res, 275-282dmg
The only thing the staff really offers is crit rating and a cheaper overall cost, though stacking crit rating isn't exactly the best thing to do in PvP.
/offtopic