larger sidewall will ride softer at the same PSI
larger diameter rim will balence easier with less weight
smaller rim will keep the rim farther from harms way at the same diameter.
larger rim will retain its bead easier at the same psi because of less leverage to pry it away.
larger rim will transfer better steering feel at the diameter tire because it has less sidewall deflection.
etc etc...yada yada yada
yeah its all just personal taste