@ezra_: I don't think it's a stomp, especially not if it's Disney Canon versions for everyone. OP says "EU" but both Disney and Legends have material outside the movies and thus, Expanded Universes. But either way, I think Legends Han, Legends Chewbacca, Enfys, and Baze is a good enough team to hold its own against even the Legends versions of the bounty hunters. They're not all as good as Boba Fett.
By EU do you mean Legends? Because if so then the Bounty Hunters probably win a majority, Boba Fett and IG-88 being the MVPs. If it's Disney versions, then the heroes probably win, as most of the Bounty Hunters, including Boba, are less impressive in Disney Canon.
Carth IS a Mandalorian Wars veteran, but he was also famed as a pilot and less as an "on-foot" fighter, and he has no real feats or accolades in the latter capacity that I can recall. Presumably he can kill small numbers of thugs or Sith Troopers with his blasters, but I think Beckett could replicate those feats easily enough. He also had a good quick-draw. Enfys Nest was too much for him, but that's a feat for her I'd say. In all, I'm honestly inclined to favor Beckett.
OK, I think SCAR takes a majority. Crosshair could maybe shoot most of them down with a ricochet-blaster bolt, but otherwise I think the SCAR team wins. Not only do they have greater numbers, but none of them have a counter to Kreel, who could easily kill any of them if he's able to close the distance.