The reason for Dolby Vision is so that the HDR image is mapped to the limitations of the screen.
Most HDR films are 1000 nits with a few at 4000nits and maybe the odd one at 10,000 nits, now as OLED is limited to about 700nits (The new Sony OLEDs claim 1300nits (But tests have shown this is in Vivid mode with approx. 750nits in film mode) most Samsung upmarket QLED TVs easily achieve 1400nits in film mode so remapping (Dolby Vision) is not needed for the vast majority of HDR films.
Instead of looking for tick boxes on features, always try the TV out for yourself to see if the picture suits you, as in a lot of instances the features you believe you want are actually irrelevant.
Bill