Normal: The standard since
Mount & Blade. Conventional. Safe. Used by probably ~60% of players.
Inverse: Gained popularity mid-2010s. Feels more natural than using Normal -depending on who you ask. The orthodox/southpaw boxing example used by
@Oakenlix is a perfect analogy of this style. Probably used by ~40% of players.
Relative Enemy Position: Extremely interesting. Offers heavy pros and cons.
Pros:
-You don't have to
think about your attacks -at all. Just click.
-Can throw chaotic chain feints by just rapidly alternating lmb/rmb -with minimal to zero screen shake
-Since there is no screen shake from your attacks, you can keep your opponent centered on your screen at all times
-No-Tell (non-telegraphed) windups, since your character's center-line doesn't turn right/left/up/down during them
Cons:
-No ability to chamber
-Little to no control of your attack direction (bad for team fights)
-Can't use specific attacks or techniques (no hilt spamming, no stabs, no high-level feints)
To my knowledge, Relative Enemy Position was used by a small handful of cRPG and PW players, no one in Native MP used this.
Movement Keys: An utterly bizarre fighting style. You'd probably have to be a savant, an idiot, or an idiot-savant to use this. If anyone in the Mount & Blade community uses movement keys for their attack direction, please step forward, so we can study you for science.