I would 100% recommend that you avoid Prism. All their TVs are using IPS panels. If they were using VA panels than they might be worth a try. Do not be fooled by their ads and reviews on their website as they remove all the negative reviews. Read up on reviews in this forum, there are plenty of disgruntled Prism TV owners here.
Xiao Mi's current TV line up if I'm not wrong are using IPS panels as well so I would avoid. However their new Xiao Mi Q1 TV might be using a VA panel, though due to false advertising of HDMI 2.1 features, I can't recommend them either.
Basically for a budget TV, the TCL R635 Mini Led TV at $1000 is the best bang for buck TV you can get at the price range (this also depends if that carouseller is trustworthy). It is not worth saving $400 on a $600 Prism TV as if you have both TVs side by side, I can guarantee you that you will see a noticeable difference especially in contrast level. Not only does that particular TCL model (R635) uses a VA panel, it also features Mini LEDs which pushes contrast level further. If you look up the TV critic RTINGS site you will see that they have measured the following contrast ratio of the TCL R635 to be:
Native Contrast
5560 : 1
Contrast with local dimming (Mini LED)
10537 : 1
The Prism will look washed out in comparison with the 55" TCL R635. IPS Panels have a typical contrast ratio of 1000:1 or below. So you can imagine how much of a difference you'd notice based on the above measurements. It is basically 10x more inkier Blacks than any of the Prism TVs with IPS panels. The Prism TVs will look greyish when placed side-by-side. If you're uncomfortable with TCL, than get a 55" Samsung Q60R for $969 or Q70R for $1140 as they both feature VA panel (though in this case, go with the Q70R instead of Q60R as the Q70R has Full-Array Local Dimming which functions similarly to the TCL R635's Mini LED technology, just slightly less effective). Avoid LG's entry level LED TVs and Sony's entry level LED TVs as they both use IPS panels instead of VA.
For Sony, anything above and including the X90J, uses VA panel. X80J and below uses IPS panel so avoid at all cost. LG's entire LCD line up uses IPS so only consider their OLED TVs.
Ultimately if you're not too fussy and do not want to spend much on a TV, just avoid any TV that uses IPS panel and you'll be fine.
If you're not in a rush, I highly recommend looking up the RTINGS website. They are a professional TV reviewer with proper tools and devices which they use to measure TVs and give unbias reviews based on the measurements. You will have a more clearer understanding of what to look for in TVs:
https://www.rtings.com/tv/reviews They can also be found on youtube.