I have about 1.5 acres I want to turn into a garden and have an interest in buying a rototiller but wonder if it is what I need vs discs and a middlebuster. My tractor is a Kubota B2320dt and the ground here (central Kentucky) in my area has an awful lot of rock under the soil, many call it slate but it is looks like what we used to call shell rock... for the most part, the stuff will peel apart like a deck of cards. Will a rototiller work in this type soil or would I be better off using discs? Thanks for your input.