My hardest decision was to get either a forward rotation, or reverse rotation. According to what I read at the time, the reverse rotation does a better job of burying plant matter, manure etc. My buddy has a forward rotation one, and seemed to leave a bit on top. Sure, company sites have pictures of how well both till in material, but that isn't necessarily so, just seeing how my buddy's performed, and he made multiple passes.
I ended up getting a Bush Hog brand. Yes, it was more, but, you can change the direction, by flipping the gear box 180º, end drive, and tiller shift/tines . Fortunately, I found one at a small independent dealer I've dealt with for years, that sells several brands, used tractors, and parts tractors. This one had been setting on his lot for 2 years, and made me a deal on it, $300 less than another independent dealer 6-7 miles away. Cash is always king on deals like this.
It was already set up for the reverse rotation. I'd sown some Mustard for a biofumigation experiment, but due to lack of Spring rain, only about 50% came up. I let it mature, but not do the follow up for the biofumigation, just not enough of it. I did mow it off, but was still pretty course. The tiller did a very good job of burying it. Ran it through remnants of tomatoes, and beans, and it also did a great job of burying/covering it, making 2 passes.
Being I cultivate, instead of tilling between rows, I don't want to be dealing with plant matter, and root mass getting caught on the cultivator shovels. I mainly moldboard plow the garden, but use the tiller occasionally. I hope to try the biofumigation experiment this Fall, and hopefully get a better stand of Mustard.