1st if your not going to leave original pegs on then of course keep them for next person who may get the bass/neck. Now for the question at hand, I would say put on the Schallers because of the fact that alot of the older necks/basses came with Schallers made for Fender. That is the more direct replacemment parts and are made VERY well.
Hey it's only $50 extra, but also why not.
