Eric Idle was involved in some of the best sketches.
Terry Jones had a unique presence that I always found amusing.
John Cleese had probably the most successful on-screen work post-Python.
And, of course, I don't think we can discount the fact that Carol Cleveland, often called the last Python, was in fact, female, which wins her a few points right there.
I think I have to go with Cleese.
1. In the Steve Martin/Goldie Hawn version of "The Out-Of-Towners", Cleese does a magnificent dance, complete with Ministry-of-Silly-Walks-esque kicks to the song Bad Girls.
2. A Fish called Wanda.
3. Live Vault web-commercial The Institute for Backup Trauma.