Hello,
both are decent and I know owners of both, I personally use cables from Tweaked PCs.
If you face any issues with either, let me know can get you in touch with either of them :)
Wont suggest pg278q at this point as pg279q or even acer xb27hu(which i think is ips panel too ) is avail
Inmo get pg279q only as its 10k extra if u consider price of 8q which is because of g-sync v2,better panel ,a bit higher refresh rate and hdmi input