Actually IPS is better for gaming.
It is around 8-16ms of response time including input lag.
With PVA it can go up to 3 frames or 50ms
Either choice, your brain will compensate for some lag/response time. Your arm is at the right position when you want isn't it? Your brain has to take action for that a few milliseconds in advance too!
PVA is better for black level. If you play lots of PacMan, get a PVA panel.
In case of the Dell lottery: the IPS is around 1:700 contrast, the PVA around 1:1200.