Being a retired mechanic on of the first things I look at is ease of maintenance. Ex mark, Deere and some of the others are pretty hard to get to things like the engine and to do belt changes. Looked over a Bad Boy yesterday. Couldn't get any simpler to work on. Undo a couple of bolts swing tank and console out and you can do anything including engine swap with ease. And not many of the way more expensive mowers built any tougher than that mower. Even I would have trouble tearing it up and that's saying something. On the Exmark engine, my understanding is that it is built by Kohler to Exmark specs.
Proud Member of Team Geezer
Charlie Weaver USN/ENC 1965-1979