I recommend the field cultivator as an all purpose tillage tool. I have a 7 shank field cultivator that I use with a
L3430 HST (27 PTO HP). In our really heavy clay soil I've had to remove a couple of shanks to pull through heavy sod in an old pasture on the first pass without overworking the tractor. After that it is a great tool to work the ground. I'm not a fan of rototillers in our soil as I think they destroy soil structure and make too many "fines" as well as compacting a soil layer below that which has been tilled. With that said, I rented a rototiller to chew up the sod after I loosened it with the field cultivator so it would flow freely between the shanks as I continued to work the field prior to planting. In any field/garden that has been previously worked, it is a slam-dunk to prepare a seed bed or control weeds with the cultivator and even a new one costs less than 1/3 of the least expensive rototiller.
I have both chisel points and sweeps, the latter I use for shallow cultivation between tree rows. For small acreages, it really can take the place of a plow, a disk and a rototiller for ground that has been worked at least once, but make sure your tractor can pull it in your soil. My tractor is at the low end of having enough power to pull the 7 shank unit in unworked sod. The shanks are easily removed (4 bolts, if I remember correctly) or moved to accomodate different row widths or spacings so it can be used as a row cultivator as well as an open field cultivator.