Yea, the basic difference today is IPS vs VA - which, paradoxically, only seems relevant on the low end, nothing above bargain level TVs use IPS - for viewing angles, and brightness as you move up the ‘price point’, and OLED vs LED. There’s a bunch of other technology (QLED, mini-LED) or “technology/marketing” (ULED, HDR10+, Dolby Vision) but that’s the crux of it.
As a layman, the big thing is that everyone says OLED looks better, and it does, but the higher end TVs are so stupidly bright that in fact, there’s a qualitative difference (and perhaps superiority) with mini-LED in many situations to OLED.
The other division is between the Brand Name TVs (Sony, LG, Samsung) vs the Chinese Upstarts (TCL, Hisense). Generally you can get hugely impressive ‘top shelf’ quality out of the top end TCL or Hisense units at a fraction of the cost (1/3?) of the similarly priced Brand Name models. The cost is that these units are much less reliable and often suffer from significantly worse ‘post processing’, motion handling, ect. Whereas now most of Sony’s effort is going into their ‘chipsets’ and their processing, for ex.
So there are Hisense and TCL LED units that reach 2000 nits of brightness (where, typically, an OLED can only reach 500-800 nits, for example, and then only briefly) for $650-$700. (The near equivalent Sony that costs $450-$500, by comparison, gets only about 350-nits of brightness, and the $600 Sony gets only about 600-nits of brightness). The similarly bright Samsung or Sony probably cost around $2000. The cost is going to be reliability (but then again, getting an extended 4-5 year warranty on a TV that’s 1/3 the price is going to be much cheaper as well) and, most importantly, probably some fussiness with certain content, where the Sony et al will handle just about anything without much thought on your end.
I wouldn’t buy a Vizio for any reason right now - they feel like a TV company about to die. The pandemic hit them hard, they seemed to have a bad year last year, and they just about failed to produce any new models at all for this year, and they’re shifting their business model to selling at low-wealth consumer stores and ad sales on their built-in menu system.