Draft Kings or Fan Duel?

I'm gonna throw a few bucks on one of these sites and see how my prognosticating stacks up. Which one is better? I kind of figured they were virtually the same but I've never seriously checked either out.

None of you making fat stacks on this??? Phone Post 3.0

I just signed up for fanduel. Not exactly making fat stacks.....yet. Phone Post 3.0