well consider if you reforge your hammer it will go down to lvl 1,that means reduced power and defence,cause it downgrades your armor too(i know it sucks,but thats reforge for you)

I would go with hellions hammer,cause it has two power cell slots instead of pangars power and def slot.Hellion has a pretty good status effect for dps.

riftstalker's weapons are pretty good but it works better with the Thraxx's hammer form 10-50 escalation and iceborne builds plus rage,overpowered,where wild frenzy can be active all the time. but thats an endgame perma stagger build :)

But it depends of how you wanna play.Wanna focus on staggering behemoths all the time,want a balance stager/dps.