Well, for one thing, I can get cleaner ghost notes with a traditional grip but for fills moving around the kit, matched grip feels better. And practicing paradiddles seems easier with a traditional grip. But, thats just me. At gig's which are mostly classic rock, its is 85% matched, 15% traditional.
The technical guys seem to prefer traditional, such as
Gadd, Smith, Weckl, Meyer.........but I'm sure others can rattle off matched players that are great......
Guess it's what feels good to the individual, and I play more like Appice than Gadd, so matched grip works fine.