So better choose cheeper LG 50UN7300 then 50NANO793NE? Both have VA panel and both don't have DV, but picture quality is the same (both have the same processor)? What other tv's you reccomend from 43-50" on VA panel and with Dolby Vision and what in the same size but without DV? Price around 500GBP. Or what is the best 3-4 tv's in that price that have VA panel (maybe without Hisense that is hard to get in my country)?
I think you are going to have to keep your expectations realistic when looking at cheaper TVs. This is why in the guide:
Low tier
Its becoming harder and harder to recommend any TVs in this price range due to the increased plethora of HDR content (most of which is unavoidable with built in apps). If your TV is a similar size and only 10 years old it may be better to reconsider keeping your current TV, or possibly treating the TV as SDR only.
HDR is basically a no-go on budget TVs, perhaps the Hisense U7Q aside. What you are buying is the ability to accept a HDR signal, not necessarily the ability to display HDR properly. Bob explained it above. Basically it means you are best treating the TV as SDR only, and any thought of which HDR formats are accepted by the TV are really not relevant, since you shouldn't be using HDR at all. You can look for TVs that accept a Dolby Vision signal, but you will not find a TV that can actually display it properly in this price range.
The same goes for other traits that are associated with budget TVs. You've mentioned ghosting, which is a product of motion blur. TVs that use 60hz VA panels are not going to be good in this area. Really you need to go up to 120hz VA panels in the mid range instead to avoid this as much as possible.
Unfortunately the market has changed in recent years and its rare to find mid-range models nowadays with 120hz panels. The gap has been filled in most markets with Hisense and TCL TVs. In Europe however there is still a big gap between availability of many 60hz VA models and no availability of 120hz VA models. This gap is even larger the smaller you go, since models like the TCL C815 which runs a 120hz panel at 65" and 75" sizes, does not run it at 55".
The cheapest way to get a TV that ticks all the boxes for you would be looking at models like the Hisense U8Q. The Sony XH9005 is also an option, but beware its HDR is still quite dim, so it will have problems in some titles. The next best would be the Samsung Q70T which like the other TVs runs a 120hz VA panel. Like many budget models though, you can forget about using HDR on this TV. At this point it may even be cheaper for you to get the 65" TCL C815. But beware it also is not a true HDR TV.
Don't be fooled by marketing of TVs, it makes you think every TV can display HDR. The truth is quite different, and TVs that can't do it properly are best not doing it at all.