I really like elements of each design. From the far left (and second because they are the same design, it seems) I really like the high-mobility looking nature of it/them. I also like the 'deadless' look of it. It adds a sort of psychological aspect that I feel would make it look somewhat spectral on the battlefield, especially when combined with what looks like a high-mobility package. From the middle (or second right) I really like the thuggish stance and posturing. It looks slow, but it also looks like it would/could pack some heavy heat. I also really like the leg assembly (the whole thing, from the hip down) it has a very nice, sveldt feel. the small foot size also makes it feel like it could move at a good clip if it had to, and has superb balance all the time. From the extreme right i like the torso likes and the slightly raised but still recessed cockpit/head area. it gives the whole mech a very functional feel, especially when combined with the intake covers(?) to the left and right of the cockpit. I also like the elongated arms that are slightly 'too thick'. these make it look like it could carry heavy weight by hand if it had to. The only thing i dont really like about it is the blockiness of the legs. I think the design would be better (personal opinion) if it had the legs of the one next to it. This design though feels the most like a walking tank, which is how i picture mecha on the battlefield: highly-mobie/nimble armored fighting vehicles designed kind of as 'tank hunters' and anti-infantry weapons more than anything else. I feel like mecha would shine in an urban or dense jungle setting more than in open field combat where fire-support could rain havoc/make terrain more impassible.
I like the third one the most. Sloped armor in its light frame makes it look suited for small-scale operations; being able to deflect kinetic-based rounds without losing mobility/agility is quite possibly its most important feature. For instance, I can imagine myself piloting something similar but without the angular armor, only to get myself killed with an AP round through the cockpit.
Not to mention I hate all AP snipers in any way and form!