I can't decide between the three Spyro the Dragon games.
1 had the best music and simplest (in a good way) gameplay. 2 had the best level designs and evolved the gameplay to include minigames. 3 is from an objective standpoint the best because it merged the best of 1 and 2 together, but for some reason doesn't stand out in any particular way.
So, I'm just going to leave my nostalgia glasses on and say 1.