FF VII is the best only if you didn't play FFVI first, and vice versa. But I'd say that generally if you like RPG's then you'll probably like VII, though I should put out that at this point in time its age will probably show.
Oh, and I really enjoyed XII, I'd say its even better than FF X, just not quite as easy to get into, and the fact that Vaan and Penelo are two of the more useless characters in an RPG ever, the music and dialogue overall was better than X too, and yes, I know I will be eaten alive for saying so, but besides To Zanarkand and Path of Redemption Uemetsu's soundtrack offerings were rather disappointing, of course, that's because I tend to expect gold from him, much like Mitsuda.