Short Answer (Or if you want something new rather than used): A Sony, Panasonic or LG 2018+ OLED is best for HDR.
Long Answer: Some specific LCDs from 2016 are going to better for HDR brightness and impact, namely: Sony ZD9/Z9D or Panasonic DX902. Aside from the Samsungs mentioned below, these two LCDs are the only sets with enough dimming zones and have 10% window peak brightnesses of 1650 and 1250 nits respectively. Which is almost triple and double what an OLED can do [Excepting the Panasonic GZ2000 with its 900+ nits on a 10% window but I've not much experience with it so can't say if it makes a big difference next to an AG9 or C9] on the same test pattern. So a lot of the scenes will have more "pop" on the these LCDs. The exception being very small bright objects in the frame, they will usually be brighter on the OLED. The ZD9/Z9D has ~646 zones in 65", ~848 zones in 75" and a mindblowing ~1500 zones in the 100"!! The DX902 has ~550 zones in 65", not sure about other sizes.
The 100" ZD9/Z9D is my dream TV but the cheapest I've ever seen it is £38k and that was a special case and used. It's ~2800 nits on a 10% window...
Samsung has really good dimming potential with the 2018 Q9FN and 2019 Q90R (320 zones in 55" and 480 zones in 65" and 75") but its ruined by their EOTF fuckery and shit image processing/game mode/upscaling/motion/fucking everything except the low input lag, which is meaningless for most modern games and it makes the image look like ass to get those low figures, when comparing it to Sony or Panasonic for instance.
Motion in 30hz games will look nicer on LCDs because of the higher pixel response times, specifically the 65" Z9D/ZD9 having a very high PRT which makes 24hz movies and 30hz games look good on it but black or near black colours shapes/lines sweeping across white or near white colour backgrounds will smear a bit but its few and far between the content it happens on. Pixelated games will prob look best on OLED due to its very low PRT, there will be no smearing at all.
Movies get the same advantage in HDR on the LCDs but its less useful here because films won't often have large parts of the frame being very bright for extended periods as its uncomfortable to watch. Plus, a space film or TV show that shows pure black backgrounds with stars on them will mostly be more impressive on the OLED.
I could go on for too long, but its getting to point where the question is pointless because you won't be able to get those sets anymore, used or not. The Q90R and the 2019 Sony ZG9/Z9G will then be the only answers, with the former being compromised in various ways [I forgot it also "only" has 480 zones in 75" which is too few for that size, the 55" will be far and away the best in this regard, edit: I made a mistake in my calculations, the 65" actually has the smallest dimming zones, at 3.76"2 per zone, the 55" model's zones are slightly bigger at 4"2 per zone, so 65" will be best for local dimming as long as the Samsung dimming algorithm can keep up with the larger screen size, if not there will be a lag between the zones dimming/brightening and the content moving on screen] and the latter being 8K, available in 85" and 98" only + stupidly expensive.
(edited the bit about Q90R various sizes dimming zone size.)