I like TNT path because on higher difficulty levels you can avoid a lot of damage with the barrel cannon move (you're invulnerable when you're in the barrels) but still do a lot of damage at the same time.
Yeah he's invulnerable while targeting the barrels and the end of it knocks back any of the Death Sheep near it. It too seems to have a hitstop though, so don't shoot it into a group of chompies unless. you. want. the. game. to. look. super. choppy.