I'm going to put in a word for broadforks, even on a rocky terrain. We have rocky soil—we're not just in the Ozarks, but on a ridge, so we're up where a lot of the topsoil has washed away and left ground that's absolutely full of limestone. Then it has been badly compacted by the builders who put in our home.
We decided to buy a broadfork because I couldn't see using a tiller on such rocky soil—I think the common garden ones would bounce right off. And we're not working at a scale large enough to get in a
tractor on our half-acre suburbanish lot. So we bought the Meadow Creature broadfork, and it has held up for two years to a lot of abuse. I have used it to pry up limestone, to pull down some rotting timber retaining walls, and to dig up the "stumps" of the ornamental grasses we had planted all over the property. It hasn't shown any damage. I'm sure we would have broken one of the less robust ones by now.
Of course, using it on our soils is no joke. I often have to jump up and down on it or angle it in different directions to get it in, and on the first year with a bed I can't usually work more than the top 3-4 inches of soil. On the other hand, it's not so strenuous that my wife (who's a very small person) can't use it, and in our second year broadforking our garden beds was much less difficult. We did pull a lot of rock out of the ground by hand each time, and I suspect that is going to be an annual chore.
So I'd say don't give up on (heavy-duty) broadforks if you have rocky ground. For our small-scale garden, I don't think there's a better tool for the job.