I love these headphones. I use them for everything. I suggest listening to your favorite tracks. Critical listening is half the fun for me.

I have both and I hardly touch my HD 600. I love my DT 1990 so much more. I use them for music, movies, and gaming. They perform everything so well. To me they're more exciting headphones with a more soundstage and detail. The HD 600 are silky and smooth. Everything feels pleasant and natural. The 1990 make me feel like I'm in the room with the band. Sound is subjective which is why I have both but if I could have one it's the 1990. But if it's your first with more to come in the future, the HD 600 is a great choice that sets a standard to what a headphone should be.