1. Order of Ecclesia
2. Symphony of the Night
3. Circle of the Moon
Least favorite: Portrait of Ruin or II: Simon's Quest. I haven't played most 3D Castlevania's i'm going by the ones i have and have played. I like both PoR and SQ but not as much as the others i have.
Can't believe OoE has only been mentioned once. Guess nobody liked it, oh well :/
How technical is your game?