does SA CRIT[insert abnormal status] really help in pve? in pvp?
abnormal status: drain, stun, poison, bleed, etc...

Crt stun, you bet... Both pve (poles) and pvp (fists + bison).
Crt drain. That's the most lol crt there is. I can't figure why did they put it there? Absorbs like 10 hp... Gives you 10 hp duh? Imo this is useless.
Crt poison and crt bleed. This is for hit-and run, and is usually useful at oly when you do DoTs. For example, the sk may use such a bow vs another archer.

so it means crit bleed/poison is useless unless in pvp or oly...

now, for orcish poleaxe, which is the best SA for pve? in pvp?
i know i'll have an advantage for all three, but which one to choose?

Critical Stun ofc

Critical stun without a doubt.