It's such a hard question. Not because I can't think of a favorite but because I can think of so many favorites. Here's a few.
These are favorites since they are classic jokers that I've seen all my life. In fact, in my own mind, I have nicknames for many of them.
For instance, I think of this first three are Sprinkleman, Biker, and Floater.
In this next set, the top row far right is Truco, sort of Spanish for tricky. Directly underneath that joker is floater again. I think of the bottom row, middle as Woopsie.
This once starts with Truco and Scatterman again. Bottom row, far left, is a variation on Owl Man (but without the Owl).