I would recommend the DT990 Pro as well - they sound amazing, but they're open headphones so if you ever want to use them on an airplane or a bus or in a car, you're going to be able to hear everyone else through your cans. DT770's are a little more multi-purpose at the expense of being closed ear cans.
tldr: for producing in your room/studio DT990 pro, for anywhere else/even djing DT770 Pro
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