I got a reverse tiller when I got the MX. Plenty of power to pull it. Things (weeds, roots, grasses) like to get wrapped up on mine in new ground. I don't think I understood how badly they get beat up when breaking new ground with rocks, roots, etc. My Land Pride is already bent or misshapen in areas from rocks. Get as heavy duty as you can if you plan on breaking ground in less than ideal situations. Tilling your grass you've mowed for years doesn't count. That's a piece of cake. Dealer said reverse would get my plots going faster.
This is the main differences I thought about.
Forward vs. Reverse
Gear vs. Chain
Slip Clutch vs. Shear Bolt
Heavy Duty vs. Good Enough
# of tines & shape