It would be hard for me to choose because pretty much all of them were great. John Candy, Rick Moranis, Eugene Levy, Dave Thomas, Andrea Martin and Catherine O'Hara routinely killed it on that show. Just luck of the draw that John Candy and Rick Moranis broke out the way they did, that Eugene and Catherine had spots on the super popular American Pie and Home Alone franchises so that most people know them. Joe Flaherty never really had a starring vehicle or even a prominent guest-star role. (although one of the things that comes to mind is his small role in Stripes where he is a member of the Czech military guarding the border not so well_) Anyway, super late to the party and bummed. I'm not sure what would be a better title. because Joe Flaherty's SCTV roles probably aren't at the tip of most people's tongues, and his movies also..."Count (Floyd) Him Out"?
Linda Cardellini gets the most overtly funny part of this clip, but it's the way Joe Flaherty's face changes at "a slab of beef" that elevates it to nothing less than pure genius.
