hi whats a base can i take for infi cryptic axe, great poleaxe, giant tresher or maybe pike?

there will be opinions and opinions... it also matters what other gear you have for merc (I presume this is for merc).

I would take GPA or GT from your list.

gt
no not mancatcher

For speed I'd go Thresher (cheaper than GT for slightly less damage), consistency and raw damage I'd go with CA or GPA.

You could go Mancatcher, but imo speed mainly matters if you're doing something like a heavy Uber Support. Otherwise I'd go with raw damage. You kill bosses so fast anyway, Static is pseudo CB which makes speed less necessary, and some bases are going to be twice as expensive as the "next best thing" because the large majority will be going for BIS.

if you want it for merc, it was superior giant thresher :) am not sure how its right now, when you could put it to spear class...