The 1973 version (two films) slaughters, nay massacres, all other versions I have seen.
Its particular qualities:
* Like a a master of paired blades, it both takes its subject very seriously, and very comedically, at the same time, and does both very well in concert with one another, managing not to have one interfere with other.
* It both gives and deserves constant attention to detail.
* Wonderful choreography, particularly of the action scenes, which are both full of slapstick, yet also tend to convey well the chaotic ad hoc unpredictability of combat.
* The reality of the risks are brought home through sudden unexpected defeats and deaths.
* An extremely good cast, well-directed.
* Amazingly good period sets and costumes.