Why Batman:

1: Batman gets all the ladies
Have you seen all the ladies batman rolls in with. Taliah Al-Ghul, Catwoman, Rachel Dawes just to name a few. Superman has Lois Lane.

2: Batman is stinking rich
Estimated at $6.9 Billion
http://www.businessinsider.com/here-are-the-wealthiest-fictional-characters-from-the-simpsons-to-iron-man-2012-4?op=1

3: Batman beat up Superman
If I remember correctly, Batman made kryptonite gloves and beat the crap out of Superman.

4: Batman is smarter
He made a lot of his tech and he also out-strategized Superman.