Learn both. :)

Python has a less steep learning curve and has a more vibrant ecosystem.

Haskell has the potential to change the way you think about programming, and its ecosystem is maturing quickly.

I used Haskell for my university honours thesis. Spent a whole year on it but still haven't had the chance to fully grasp the concept of monads yet, but I'm not sure its because they're complicated or because I didn't need them.

I use python + django at my day job.