I've found English to be the easiest. if you know the right players, you can turn -any- team, no matter how bad, into division champions and superbowl contenders by the time you come out of the second english draft (2010). English 2009 is just filled with talent, a lot of it in the middle rounds, and 2010 actually has even more!
I don't play english anymore because it's just not a game anymore if I do.
I've played zazzali twice but didn't get very far either time because I hated my playbooks.
I've played jones three times now and I like it. It's got players of the same caliber as english, but not as many of them.
Never really played sweetney.