Either or neither, there are too many variables to give a definitive answer. Whatever works for you.
There are in theory a number of advantages in bi-amp setups, and even using different amps per channel and/or speaker.
Having done this the only clear advantage I got was by running an active crossover and using a class D amp for the bass and a valve amp for the tweeter, however there is a fair amount of faff involved in removing the speakers internal crossovers from the equation and then tuning an active one.
CD->Integrated->Speakers these days, so much simpler.