Type 3 shows the most effective form of mobility out of the rest. the bracing heel at the back of the feet can adjust and cam at necessary intervals to adjust for unstable terrain and balance as well as support high speed movement and jumping capabilities. The weaponry on Type 3 appears lacking however.
Wait?! U know Chrome Hounds? If so, whats sucks now is that they stopped the online server and u can't play online on that game anymore but u can only play single player on that game, also most of the Achievements on that game is mostly online so if u have it, u can't get those Achievements anymore which sucks because I like that game a hell of a lot. Classic though but yea, I have the game still.
Middle one feels like Feedback, down to the armament, there a reason you traded away from weapon arms? (other than reminiscent looking designs that people casually assume you copied lol [example: Metal Gear Rex's railgun])
? What I meant was why did you decide to switch over to armed (arms as in manipulators) in variation 2, when you had solid fleshed out designs here. If you remember Armored Core 4/4A Feedback, has a very iconic stance, specifically like your middle design.
The left one. I think if you took the lower legs from the middle one and incorporated them into the one on the left you'd have a really believable design. It looks very WWII alternative history-ish. Almost like a German Pzkpf 3 with legs.