Well, ask yourself:
1. How much do I want from chess.com? Am I serious enough about chess to use all of its training and playing features like chess mentor and computer workout?
2. Do I have the money to spare each month or year on any of the premium memberships?
3. Would I feel good knowing I would be contributing to the corporate entity of chess.com?
I want to buy a premium membership soon. But i don't Know which one.. Which do you prefer?