Team CW lose round 1 hard. Arrow has no stats to match team MCU and gets taken out pretty quick. Then it's Slade vs those two and he won't last long.
Round 2 also goes to the Marvel crew. Ollie's arrows are completely useless against Panther as well as Cap's shield. And those claws and shield will be able to get past Mirakuru.
In round 1 Slade doesn't even have Mirakuru, so it wouldn't take much at all. And if he did, it's still well within their power as T'Challa fought evenly with a slight seeming physical advantage over Bucky out of his suit. And Cap is Cap. He's got 5 movies and word of mouth feats(like pushing a bulldozer faster and easier than Deathlok) that make it well within his capability to f*ck Slade's day up.