So with that in mind, are you essentially suggesting the fx block chorus will sound better than the cho block?
Well, the Prime and CE-1 algorithms are derived from the MD-500, so they should sound slightly nicer, but I haven't really compared them. Let your ears be the final judge.
Also, don't forget the bass chorus. If it works anything like the pedal, it splits the signal to keep the low end clean. But you can also do the frequency split with a divider (~200Hz should be good) and use whatever you want in the high band.