I throw almost exclusively DX. I keep a newer Champ Roc and TeeBird for hyzers on windy days, and for shots where I need a harder fade. And I have a Star TeeRex for overhand shots and spike hyzers, only because the Star plastic stays stable so much longer.
Why DX? It's grippy, it glides better in my experience, it's cheap, and it beats up quickly.
If I lose a beat up champ or star disc, I've got 2-3 months of disc golf before I can get a new one to beat up. Basically, I lose a disc that can't be replaced for some time.
Keeping 2-4 DX discs of the same mold, each beat up in different stages, means that if I lose a disc, I've got one that's right behind it, ready to take its place.
Also, I remember seeing an article where all the Innova plastics were tested for glide, and the DX came out on top. Anyone see that article/post?