76 keys are great if you play piano. Also makes splits advantageous. The Tyros 5 is very bulky and one of the
reasons I sold it and bought a Korg Pa4X with 76 keys.
The Korg is much less bulky, has a metal case instead
of plastic and black for me is a better choice. The
Tyros 5 is a great board and has great sounds & styles
so if the bulk is not a problem for you go for the 76
keys. Lloyd