I can see where a ripper preceding a tiller would be a good idea in unfamiliar territory, however, in the thirty+ yrs I have been tilling gardens, lawns and fields, the initial pass breaking up sod is the most important. Once the sod is broken it just gets thrashed around and doesn't break up as good as it can be on a fine initial cut. After that, especially in gardens that get tilled every year, I have taken my ripper and subsoiled to break up the packed ground underneath down about 18", then taken a final pass with the tiller.
Before spring gets here I hope to modify the ripper so I can slip it on the loader. The bucket is quick detach from the loader frame, I just have to put the link ups on the ripper, then I won't have to deal with the 3pt on the job. Work both ends at the same time.