Wonder Woman has the best chance of soloing .... she could lasso Cap, toss him into Iron Man, gut em both with a punch at the same time in no time flat, then she can focus on her apparent equal ....
Since she has high resistance to magic, and insane blunt damage soak, she can take most if not all he can give. She's faster than Thor in the heat of battle, her tiara and bracelets make up for her lack of a sword and shield (since her other weapons weren't specified in the OP). Throwing magic around is pretty much useless on both their parts since Diana can simply block, dodge or deflect every lightning blast that doesn't take a minute or more to charge, and Thor would likely block, absorb, or deflect any lighting blasts from her bracelets or even deflect her thrown tiara with his hammer ....
Combat is the main issue, she's faster, hes more durable ... she's got the striking speed output, hes got the striking power output .... she's got the bladed tiara, hes got the blunt hammer .... they both have the skill .... but with a weapon that can behead gods in one throw in the hands of a faster opponent, speed will be the deciding factor and that is what will give Diana the win here 6-7/10 .... If she were to do it alone. Technically, those are her chances against Thor mostly since the other two hold no weight against her.
Bruce if reliant on his gadgets can take Steve ... he could impair his senses with the array of sonic grenades, concussive grenades, flash bangs, smoke gas, nerve gas, and any other chemical gas pellets he's got on hand. He could even whip out the bane of Captain America itself ... Ice Pellets ... he won't have the convenience of being near water like Sandman was, but he'd be smarter than Ice Man was and freeze him whole, not just his legs .... the shield would definitely defend against typical batarangs, shock batarangs or even explosive batarangs, but if Cap throws it and the Bat isn't hit ... there's an open window for Bruce to unleash technological hell upon Steve. Even if that shield ricochets off a garbage truck, off a wall, off a fire escape and comes back down on his head, Batman would have already made his move and taken out Captain America .... The chances of the shield missing completely are moderately good if the other gadgets mentioned take effect, disorienting Steve, throwing off his balance and aim. Those gasses and flashes would greatly influence both a ranged encounter and head to head combat with Captain America to balance out physical advantages with technological ones, and the shield wouldn't be able to defend against most of those other gadgets ....
With all things considered, gadgets included, Bruce can beat Steve on his own 6/10 contrary to popular belief.
I don't have to discuss how the fight between Tony ans Clark would go, do I? That fight would last shorter than a fight with John Henry Irons (at least his suit repairs itself automatically), since he could tear through it too fast for Stark to notice and without the slightest problem. Unless the OP changed the setup, to where Tony somehow hooks up with Lex and does a business deal where Tony rents the Warsuit for a day, he hasn't the slightest chance for survival here. Obviously Kal-El wins 9/10 (the 1/10 being if that deal with Lex is made and Superman decides to be moral about his approach in this fight)
Anyway, the DC Trinity wins. Wonder Woman can solo with moderate difficulty, Superman can solo with serious difficulty ...
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