Additionally, the differences between the PG278Q and this display are:
-PG278Q has better response time overall (a few milliseconds), but performs
slightly worse with regards to stability of images in motion with normal overdrive at 144Hz.
-XB270HU has 29% better contrast ratio than PG278Q.
-XB270HU has much better viewing angles. Much more viable in portrait mode because of this.
-PG278Q supports ULMB mode at 85Hz, 100Hz and 120Hz. XB270HU supports ULMB at 85Hz and 100Hz.
-PG278Q supports Nvidia 3D vision.
PG278Q Response with Normal overdrive at 144Hz
XB270HU Response with Normal overdrive at 144Hz
Overshoot will probably manifest as ghosting of objects in motion. Both displays are excellent in this regard though.
Please read the reviews at tftcentral. We should be encouraging thorough, in-depth display reviews like these.
PG278Q review.
XB270HU review.