>>96485129
Roller - ball with arms that doesn't need legs and painful when collides with someone.
Centaur - faster but more sluggish and easier to damage legs.
Crawler - solid, stable, hard to stop and good for carrying a lot of stuff.
Drider - surprisingly mobile even at larger sizes due to sidesteps, but legs are vulnerable, so isn't good for prolonged combat.
Wagon - cheap, fast, easy to make but has a lot of problems going in rough terrain and wheels are pretty damn vulnerable.
Walker - standard humanoid
Worm - good for burrowing and therefore mining, also for ambushes where it comes out of earth and disgorges troops or smaller mechs from inside, but very slow.