I have never liked Superman. I dislike the very concept of the character and have numerous beefs with it that I'm not going to go into here. Plus, the movies [and tv series] are just so-so.
Batman, on the other hand, is a fascinating character which has produced several excellent movies [and a few lame ones]. But right now the franchise is definitely on top of things and I can't wait to see the next installment.

Since Christopher Reeves, they haven't been able to cast a good Clark Kent/Superman. Plus, Batman is just more awesome in every way.