You know, that is a good question spadesmamma. Through extreme research, or watching the movies, i would have to say that yoda is the man for various reasons. When he fights the guy spins, flips, jumps off walls, and other vary insane things. When watching the others on your list, i laugh, because they are boring fighters. they just don't have that pizzazz, or whatever you call that certain somethin. And it always seems they let there guards down and get some body part slashed or knocked off. Not a tough choice at all.
Thought alot about this off and on for last few days....while I do believe Anakin/Darth is truly a bad ass.....in a straight saber duel I'm going to have to go with Yoda as well. My main reason for this is because as of yet he hasnt been defeated by a saber. Dooku distracted him if you remember with that huge pipe. Had he stuck to the saber I think yoda would have won. But then thats just my opinion I could be wrong! 😉