I mostly agree with @fernandez , the biggest differentiators between the AD700 and DT 1770 headphones are the soundstage and isolation.
The AD700 have a remarkable sense of space and imaging, rivaled only by (in near price range) the AKG K612, K7XX, and the (discontinued) Sony MDR-MA900. For gaming, you really get that sense of “air” and space between where the sounds are coming from, and that helps a lot with immersion and tactical awareness...