Heya,
Neither. Why would you want either of these headphones for gaming? They have cramped sound stages.
I imagine you need closed headphones for privacy, based on your choices here? Open and semi-open tend to have better sound stage and imaging for gaming specifically. If you're looking for closed headphones, I'd point you towards the Beyer DT770 PRO and Ultrasone HFI 580 for gaming in that price range. Otherwise, something like the D2000 at a higher tier for everything (including gaming). For open, if you consider it, I'd point you directly to the Fischer Audio FA-011, then DT880/DT990 or HD595/598 at higher costs depending on taste.
Very best,