The DT 880 PRO has a very linear frequency response, while the DT 990 PRO has a slightly more accentuated bass and accordingly more present trebles for a pleasant balance. Both are primarily designed for studio applications.
The TYGR 300 R focuses on gaming and is based on the frequency response of the DT 990 PRO. A powerful bass and detailed accentuated treble go very well with gaming. However, the sound design of the DT 990 PRO has been further optimized for gaming, sometimes through the use of a special acoustic fleece.