Whether it be the EA series or the 2K series, I think that they're both a lot of fun. Sadly, NHL 2K11 has only been released on the Wii and App store. The good thing about this now is that I won't have a hard time choosing between the EA game or the 2K game (though I could get the 2K game on the iphone).
One thing that I really like is the fighting and I think that EA do a better job with that. You can only have 3 fights per game and I usually have all 3 in the 1st period.