this isn't about powers as supes wipes the floor with both spidey and bats I'm talk about who you personally like best so I guess its a popularity contest. for the record
1. spidey (ok a little bias

)
I think his motivation for being a hero is the best in comics.
could have prevented his uncles death and pure guilt drives him to not overlook another crime again.
what I like best about him: also like the fact he pays his own way.
favorite spidey moment: totally out of his weight class v the juggernaught and is taking off his outfit and preparing to blend into the crowd, decides someone has asked for his help and he can't turn his back (like he did with the mugger that killed uncle ben) so puts on his outfit to face juggy even though he will almost certain and he actually WINS.
2. batman
second best motivation in movies. wants to stop crime destroying lives like it destroyed his family.
what I like best about him: He has no powers, ANYONE could become batman with enough dedication, training (and money)
favorite bats moment: JLA,the white martians have taken out the whole justice league and batman alone storms their strong hold. THREE martians (virtually supermans equal) surround him, batman lights a ring of fire around them 'ready when you are'
3. superman
he's been around the longest and virtually every hero is influenced by him but I don't see what his motivation is for fighting crime.
what I like about him: hmmm...I get back to you on that one
favorite supes moment: 'burn'