Chris Pratt vs. Chris Evans -- Super Bowl Wager ... 'Best Bet I Ever Lost'

Choking to the New England Patriots wasn't so bad after all ... so says Seahawks mega-fan Chris Pratt who says his Super Bowl wager with Chris Evans was the "best bet I ever lost."

Of course, Pratt agreed to visit the kids at Evans' Boston-based charity after the defeat ... dressed as Star-Lord ... while the "Captain America" actor taunted him with a Tom Brady jersey.

The kids loved it -- and clearly, so did Chris, who told us the whole experience was "beautiful."

The clip's pretty great ... especially the part where Pratt's famous friend (an actor who's been in a bunch of stuff) jockeys for camera time on the way into a bar ... hilarious stuff.