Possible leg layouts for a bipedal character and their comparative stats on a scale of 1-3. The player character will proooobably be limited to being bipedal, but vehicle mechs will have a much wider range of options.
Loadbearing: how much weight the configuration can handle
Stability: how easy/hard it would be to slip and fall
Power: how much power the leg can output, for jumping and running
Maneuverability: how well the leg can pivot
These are overall structures, but I plan on the player being able to fine tune and upgrade individual components.
[edited a few values after posting]