Are you referring to skill or strength? Vader has the advantage of a potent connection to the Force (allowing him to enhance his physical abilities) as well as considerable strength from his mechanical limbs. In terms of acquired ability and skill? Darth Maul or Mace Windu would likely be the winners.
That's very difficult to say, even moreso than hypothetical lightsaber duels and Force fights; Maul is a ferociously trained martial artist who has "pushed his physical and Force-assisted abilities to the utmost" (Complete Visual Dictionary) to the point that he was able to wipe his ass with four remarkably talented fighter droids, unarmed, in about sixty seconds and dismember the hordes of the most powerful crime syndicate in the galaxy, Black Sun. Mace Windu has overcome a contingent of battle droids and super battle droids (as well as seismic tank, if I recall) with his bare hands. Vader possesses extreme physical strength and a stronger connection to the Force than either Windu or Maul (and would so be able to enhance his physical attributes further) but decisively lacks their physical conditioning and background in martial arts.
In episode II, in obi wans fight against fett, he showed us that he has a ton of skill in hand to hand combat. Mace is strong and pwned some noobs in shatterpoint, maul is skilled in martial arts, anakin posseses a mix of strength and fighting skill. "Hard to tell, the future is."
I need to go rewatch Jango versus Obi-Wan. Does he win out of virtue of enhanced Force ability or actual demonstration of field tactics and martial arts?
Jango's good, but he wouldn't last long against the top Jedi for hand-to-hand combat. Mace, Kar Vastor, Maul, Iron Hand (the order's hnad-to-hand combat instructor) would all make short work of Jango. As far as I am aware, Kenobi has never been called a master of hand-to-hand combat.
Okay. I was just saying why he wouldn't win though, you should have put Kar Vastor up on that list instead of Jango. But, you said you haven't read Shatterpoit yet, right? So, you wouldn't know who he is.