I played both for a long time but I drop Nutaku recently. They don't bring enough new things, every new "great" stuff bring a ton of bugs, a great lack of bloom form, not enough FG to do regular rolls or aim for a special girl... and only event I already did on DMM. For the last point, it's not Nutaku fault at all obviously, but with all the previous flaws, it was no more funny.
But I can't say I hate Nutaku. I think I hate more DMM and it's poisonned FG than Nutaku. I just don't care that much anymore of Nutaku. Thank to them to let me know and learn the game.