When people create these polls, I wish they would say if they wanted votes based on fighting or based on how much we liked the films.
Combat Version
Round 1
Hulk vs Wolverine
Wolverine and Hulk square off, Wolverine's quick, and gets some claws in to get Norton's Hulk mad, but Wolvie isn't super soldier quick, and catches the edge of a backhand. If Hulk presses the charge, he can get to Wolvie before he's all healed up, and finish the fight. If not, Wolvie heals, while Hulk licks his wounds and it happens all over again until Hulk presses the charge, which would happen before angry Wolvie can figure out how to out fight this huge monster. Who's the best there is at what he does now?
HULK
Spider-Man vs Captain America
Cap's good, but Spider-Man is in a different league physically. Shield throws may catch him off balance the first time, and Cap gets more than a few hits in, but once Tobey's Pete gets his senses back, he's webbed Cap's feet to the ground, dodged a flying shield, talked some smack, dodged the shield on it's return with Spider sense and knocked Cap out cold. From red white and blue to just black and blue.
SPIDER-MAN
Superman vs Thor
There's no denying the god of thunder is nothing to mess with, capable, at the height of his power, of toppling a whole valley with a downswing. Reeves' Superman can push the moon though. In comics Superman is vulnerable to magic, but in the movies, he's not, and magic is just science anyway. Thor knocks Superman around a bit until Superman gets serious and grabs him and throws him into space. When that doesn't work, he throws him into the sun. It looks like Superman really is the worthiest in the nine realms.
SUPERMAN
Batman vs Iron Man
Well, this Batman has no prep time, and finds himself severely outmatched. Pinned down by military grade weapons, this Batman may fire off an EMP to shut Iron Man down, but can't crack the shell before Tony reboots and hits the guy with a repulsor blast. It takes Tony and JARVIS a few more moments to disarm Batman of his belt, leaving Batman defenseless, and a spiteful Tony one right cross from victory. Maybe Batman can rethink that policy against guns.
IRON MAN
Round 2
Hulk vs Spider-Man
This Spidey is very quick, and with Spider-Sense at the ready, inconsistent as it may be, he's going to dodge Hulk most of the time, and while he may catch a glancing blow here and there, he's going to be able to recover before Hulk can reach him. It won't take him long to see that punches don't work, and while Hulk with Banner in control may come up with some slick maneuver to sidekick the web slinger, a desperate web in your eye helps the durable contender put Hulk totally off balance. If Spidey can find a way to finish him off, he would win, but he can't, and so a blind Hulk rips the webbing off his eyes and continues the assault, perhaps indefinitely, until Spidey makes a mistake, and then with two broken bones against him, the battle becomes very one sided. Why is his spider-sense tingling so much? Wham.
HULK
Round 3
Hulk vs Superman
For the final bout, we have Ed Norton's Hulk against Chris Reeve's Superman. One catches Super soldiers off guard, the other catches bullets while pretending to fall down. One throws cars, the other throws around continents. Jumping like a free runner vs flying faster than the speed of light. It would be an understatement to say Hulk is outclassed. Even the buffer brawnier Ang Lee/Eric Bana Hulk is outmatched here. All hereos are, because unlike other comic book characters, Superman was not toned down for the films, if anything, he is more capable than he usually is in comics. Perhaps, Dr. Manhattan can get in the next tournament, and then there may be a scuffle.
Champion: SUPERMAN
Movie Quality Version
Round 1
Hulk vs Wolverine - Wolverine wins. Even though I don't think the did any of the other X-Men justice, as Wolverine movies, the X-Men series was great, and fans of that character loved the movies. Everyone else, myself included, felt jilted. While the Hulk movies were deeper thematically, and better acted, they lacked the fun that Hulk so easily lends himself to. They overthought it, in both cases. Winner: WOLVERINE
Spider-Man vs Captain America - Tobey's series really was everything you'd want out of a Superhero franchise. Fun, deep, packed with comic book villains (for good or ill). It was an event. Captain America had its moments, but in many ways, felt like filler on the road to Avengers. It didn't even have a proper ending, it just started the Avengers movie. Winner: SPIDER-MAN
Superman vs Thor - Superman was groundbreaking, to say the least, but we can't ignore that the last two, the last three if we count Returns, were abhorable. And they don't hold up entirely well in the present day, which is where we are. Thor was fun, if light at times, with a very sympathetic villain, if he was a true villain at all, and a believable love story thanks to a good actress. It looks like it's going into sequels, too. So with all respect to the Model-T Ford, I like my Mustang better. Winner: THOR
Batman vs Iron Man - I don't want to call it a foregone conclusion, because Iron Man was a great movie, and Iron Man 2 was a lot of fun, but the Begins franchise just delivers on too many levels. RDJ brings home the bacon, but Bale, Nesson, Caine, Freeman, Ledger, Oldman, Eckhart and co bring home the bacon, eggs, pancakes and biscuits with gravy. Nice action sequences Iron Man, but, it's the gosh darn Batman. Winner: BATMAN
Round 2
Wolverine vs Spider-Man - Whew. Great franchises of the early 2000s with a bad third installment. No, not the Matrix, the other two. To Wolverine's credit, the X-Men movies are still going, and he's been in all of them. But they're not really the Wolverine movies, they're the X-Men movies, and as X-Men movies they've managed to tee off everyone who isn't a Wolverine fan - and some of them too. Spider-Man stopped when it needed to. No bad solo movies packed with ludicris action and forgetable story. No crazy period movies. The core of what makes the franchise great in comics was gone, so they gave it a rest and are starting over. I respect that. The thing that really puts Spidey movies over are the believable emotional arcs. For all the venom shenanigans, when Peter fights Goblin Harry in SM3, the audience is there with them, and Wolverine still hasn't been able to deliver that with his retcon storylines and 3 day love affairs. Winner: SPIDER-MAN
Thor vs Batman - ... I'm sorry, I don't feel this has to be explained. It's not who you are underneath, it's what you do that defines you. Batman does more. Winner: BATMAN
Round 3
Spider-Man vs Batman - The start of the new wave of superhero movies or the crowning of it? Hard call, but overall, TDKR seems like it'll end the series on a high note, as it doesn't have the executive shenanigans that killed SM3. Even without that gimme, Batman does everything Spider-Man does and more. I've got to give it to the bat.
Champion: BATMAN
So, my winners are Superman and Batman. One for power, and the other for story, and to be honest, that makes a lot of sense. Superman is always the strongest, and Batman is always the coolest.