Kriss vector or zennith zf5?

Kriss vector or zennith zf5? ( guns / AffectionateWay721 ) Trying to decide what I want to pick up next. Whatever I decide to get will be made into an sbr which I already done the whole tax stamp process before with my scorpion. What do yall suggest? kriss,vector,zennith,zf5,kriss vector zennith,zf5