In the TV market a TV should support HDR10 if it is marked UltraHD Premium.
RTINGS is the best site for comparing HDR TVs as they provide proper measurements and how well they compare the full extent of the spec.
http://www.rtings.com/tv/reviews/best/by-features/hdr
I think you're getting your terms mixed up. OLED can be HDR. They aren't exclusive.
OLED is a technology. HDR is a standard.