in this case i doubt it makes a difference. i never heard of the counter rotating kind. i though the forward rotation was what what propelled it. if you want a tiller, i'd get an older troybuilt horse 8hp. if thats too much, go with a pony. whatever you get, make it a rear tine.
I used to have a Pony, the 3hp one. It had forward rotating tines that made it useless in anything other than soft soil. If it hit anything even slightly hard, it would jump out of the ground and bounce over it. It was a miserable thing to use. It was easier to just use a shovel and spade the ground.
