I don't know if I'm much help, but I like all the versions of this sketch!
It's funny seeing Kermit, with his classic double-takes and mortified look, as the "worm" keeps poking at him...and then his look of fear when the giant monster looms over him.
But Lenny's version (from the Rich Little ep.) is a classic, too. I love when he mumbles to himself, and the laugh he lets out when he thinks he's bettered the worm (Kermit did the laugh, too).
They're all amusing, and one of my favorite bits of Henson mayhem!