Are you shopping only at the "big box" stores? If yes, most of them are
mtd...although I'm not sure about the JD. If accessories are **very**
important to you, my opinion is you'll get better info on them from a
dealer. You'll get better service and parts support too, generally
speaking. As for engines...both have their fans. My 6 year old Briggs
has never given me a problem. If you have to move snow, that needs a
little more discussion. Depending on your location and amount of snow,
you may be better off with a walk-behind snowblower. Plowing with a
lawn tractor wouldn't be my first choice.
Your mileage may vary.

GrtArtiste