DisplayPort 1.2: Supports up to 4K at 60Hz, some 1.2a ports may also support AMD's FreeSync DisplayPort 1.3: Supports up to 4K at 120Hz or 8K at 30Hz DisplayPort 1.4: Supports up to 8K at 60Hz and HDR ...
If a monitor only gives you the choice between, say, HDMI 2.0 and DisplayPort 1.2, HDMI could be the way to go for HDR support, as long as all your devices support the HDMI version. Ultimately ...