I've made recordings of a number of Sega Mega Drive-compatible consoles playing back the same music. The audio below has been normalised.
A. Sega Mega Drive 1 (output via headphone socket):
B. Sega Mega Drive 2 (output via AV socket):
C. Sega Genesis 2 (output via AV socket):
D. Sega Mega Drive 2 with CCAM Mod (output via additional RCA sockets):
E. Sega Nomad (output via headphone socket):
My favourites are A and D, but I think for live shows D is a better option because of the form factor of a MD2 compared to the bulky MD1.