Match-by-match-
DC's Gauntlet:
1. Wrecking Crew -They can take the Crew in a fairly strait fight. Clark and WW go strait on, Bats hangs back and provides the odd distraction. Some bruises, but it doesn't take long to win.
2. Circe -Diana's arch nemesis. With her pals backing her up, again, fairly strait win.
3. Classic Juggernaut -May take them a bit of trial and error, but they have the lasso in their favor.
4. Dark X-Men -Fairly tough fight, but it's really just Pointer and Nate that are the problems, and Omega's going to go down. Nate has potential to stop them, but with planning they should be able to have Bats hit him with something to stop concentrating and using his powers, or get him in the lasso, or so on. Tricky, but winnable.
5. Mongul with Rings- Quite tough, but I think a bit less-so than Nate. They know Mongul, they know the rings, they have a numbers advantage. Heck, if they got Bats a ring, he could use it.
6. Darkseid (non Jobbing)- Pretty much the same as Mongul. They know the threat, it's hard, but they can manage.
Marvel's Gauntlet:
1. Flash Rogues- (assuming the line-up I guessed in the previous post) A solid but tricky win. They'll win, sure, but they'll have to work for it and it'll take awhile since the Rogues are quite good at making pests of themselves to stronger foes.
2. Loki- Much like Circe above, they know what they're up against, the trio wins.
3. Genocide- Here, it's harder than the Juggernaut fight the DCs had because there's a real chance for loss. Collectively they have enough strength to handle her, but if she takes Thor down (likely using the lasso), then they're screwed, it's over. So they'll have to really have their act together.
4. Fatal Five- I don't see how they can win. If it was the Fearsome Five, they'd take it reasonably solid after a battle, but they can't beat these legion foes.
5. V&V Despero- They're outpowered here. It's an uphill battle, but they do have some chance. Better have Thor go all-out from the start, and Tony empty his power cells into Despero.
6. Cyborg Superman with Rings- One tough factor is he'll probably take out Tony fast, which'll suck. I think Hershaw probably wins, but if Thor does a god-blast or something and blows off his ring hand, they have a chance.
DC's hardest is 4, which is winnable but quite hard, but 1-3 have little chance against them, and 4-5 are tricky but the kind of stuff they can handle. Marvel hardest is 4, which they cannot win, but they stand a reasonable chance of losing to 3 too, and 4-5 overall have the edge against them. Even among their wins, 1 takes longer than the other team's 1.