I like the forum the best because it is good for sharing ideas and learning more about the game.
What is your favorite thing a bout chess.com and why?
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The video lessons are absolutely brilliant and worth the cost of a subscription, even if the rest of the site didnt exist. That along with the helpful attitude. I've personally helped many people rated lower than me to understand the game better, and I've also had many people help me out (in fact, two of the former #1 players on the site have spent a great deal of time with me with absolutely nothing to gain (or at least very little) for themselves).
So I guess it's hard to say... probably the people.
the groups and friends because they help me to get better at chess