IIRC, the Sega CD version of Flashback has music. The 3DO has a nice song at the beginning...but that's it. I actually really like the music in the 3DO Out of this World, even though it's not the original.
As for me, I have both the FZ-1 & FZ-10. I suppose I prefer the FZ-1, but I think it's cuz it's the original model. The FZ-10 is more compact & does have a memory manager, which is obviously more practical.
I like Guardian War, Luciennes' Quest, Cannon Fodder, Captain Quazar, Blade Force, Bust-A-Move, Cyberdillo, Dragon Lore, Fun 'N' Games, Gex, The Horde, Insector War, Kingdom: The Far Reaches, Lost Eden, Gridders, Need for Speed, Out of this World, PO'ed, Policenaughts, Return Fire, Road Rash, Soccer Kid(though I prefer the Jag version), Space Hulk, Strahl, Syndicate, Trip'd, Wolfenstien. A lot of those games can be found on other systems ofcoarse, but I tend to enjoy them most on the 3DO.