Only you can know for sure, though experimentation--there are a lot of factors that come into play. On my stone (which is a fast cutter for a finisher), I find using a diamond plate offers more control & less chance of overcooking the edge, while my tomo is actually even faster cutting but is easy to overdo it.
If I had to guess, I would say there is probably more variation in particle size when using the DMT, along w/ a controlled, slow release of fresh particles into the mix, which limits how small the average mix can get, whereas the tomo does not. That being said, finishing on DMT slurry is noticeably sharper & smoother than crox. Tomo slurry on mine is often too much of a good thing.