Now before you bring up the crap with Peter vs. The Chicken, Homer has some impressive fighting feats of his own.

-fought Bart's older brother up and down Springfield Gorge.
-only ever lost a boxing match to a guy who could ask prison inmates and cops to stop riotting...and they did it.
-fought with a biker...using motorcycles to hit each other over the head.
-has taken cannonballs to the stomach.
-had a bridge close on his head.

I think Homer wins.