no, everything is built to the same rules, there are adjustments for designs of differing eras but no super units, just incrementally better. The back fiction and the game rules are base don the fact that the game is designed to be player on player. while some mechs are better generalists that other, it is because some specialize more on different aspects of combat such as sniping or close quarters. for example in an urban environment a hunchback will murder a Trebuchet owing to the AC/20 strapped to its shoulder, while if you stick a Trebuchet on a ridge watching over somewhere with little cover and the LRMs it packs will cream the hunchback