What is the difference between HDR & black on a q70a?

An HDR signal produces a significantly brighter picture, with a peak brightness of 559.106cd/m^2, but a higher black level of 0.062cd/m^2 to go with it, for a 9,018:1 contrast ratio. The Q70A’s backlight doesn’t use a dimmable array, so there's no notable difference between full-screen and 18% fields in peak brightness.

Is a q70a better than a VA panel?

The Q70A offers better performance and more features. While they're both VA panels, the Q70A has a higher contrast ratio and similar viewing angles. It also has a faster response time, a 120Hz panel, and extra gaming features like VRR and ALLM, as well as an HDMI 2.1 port for advanced consoles.

Which is better q80a or q70a?

The Q80A has an ADS panel, which has much wider viewing angles. It also gets significantly brighter in HDR, so highlights stand out the way they should. However, the Q70A has a VA panel with a much better contrast ratio and improved black uniformity.