If you are a great player a monophonic synth will sound awesome in your hands .... if you aren't a 128 voice polyphonic synth will sound like a mess. Stacking sounds to the ceiling aint gonna help but will probably make things just sound even messier.

Just learn to play and don't get so hung up on polyphony. Musicality beats technicality hands down every time. Personally I prefer simpler pure sounding voices. Sounds that are over stacked just sound fake and don't blend as well.