while i'm still quite new to this motorized bicycle thing, i have no idea which motors preform best. i'm sure you'll hear many different opinions about each and everyone.
that being said, i have no idea who manufactured my engine. i bought it cheap from kijiji (new in the box)
it had no company info on the box or in the instructions. no customer support no. no contact info, they didn't even give credit to the company that made it. (on the box, engine or in the instructions)
i think you'll find for the most part, all the chinese made 2 stroke 49 and 80cc bicycle engine kits(like the one i'm using) look pretty much the same.