I haven't played all DK games, just DKC, DK64, and DKCR. But if I have to choose one, I choose DKC because I have really good memories of this game (Rare + Nintendo was an awesome combination), but I think that all the DK games I've played are great. The second possition will be for Retro's game, they have done a good job with DKCR (It would be fantastic to see a DKCR 2 in this year's E3, but I don't think this will happen).