Personally,
While I believe that classics are more artistic and more fun than most newer style games, I don't think a game room is complete without having some Jamma games and cabs represented in the mix. To that end, its only a matter of taste. I think the Dynamo HS-5 is the epitome of the perfect jamma cab (which is why I own like 5 of them.) I have a friend that has a Naomi that I have done a lot of work on and would have to say that cab is equally impressive although not quite as versatile IMO. But its certainly more attractive. As for candy cabs, they look fairly plain but perform their task admirably. IIRC they have a 29" rotating screen which is nice. My only problem with them is that I think some of them are sit down cabs which just seems lazy to me. If your too lazy to stand at a game to play, you shouldn't be playing to start with. But hey, that's just my 2 bits.