The synthesizer will give you more flexibility with add ons and effects.
Synthesizer keyboard. It's the way of the future.
Idk... That is something to think about.
Buy a keytar.
i don't know much about it, and this may not be an issue by now, but once upon a time, synthesizer keyboards wouldn't give you key velocity (or whatever the term was)....for piano music, you wanted the way you strike the keys to shape the volume and the attack on each note....