Playing hidden is that mod where if you're good at it, or at least decent, then use it. (Gives a slight pp boost) Learning how to play HR will help you in the long run with PP because you can play shit beatmaps and get a lot of pp of it. DT is harder because speed is harder to improve but gives a huge PP boost. I find that its better to play HR as a main mod, but if you like DT more then play it (But limited amount of maps to play depending on skill level). That mod is probably the only reason why I'm still playing this game, its fun to use