TCL, in my opinion...both TV's are the same price, size and have local dimming. One difference is the Hisense has a 120Hz panel and the TCL has a 60Hz. Some people are sensitive to refresh rates, so I'd look at both in the flesh to see if you are. Other than that, the main issue with this would be if you use it as a PC gaming monitor as you'll be display limited to 60 FPS. Current consoles don't have that issue as they cap at 60 anyhow. If you don't know what I'm talking about there then it won't matter either way other than doing a real world check to see if you're sensitive to refresh rate (most aren't at 60 and above). Supposedly a higher refresh rate will help with fast moving content (sports etc) but then a 120Hz panel (particularly in this price range) can have the "dirty screen" effect (dark blotches in large areas of one color, ie. a football pitch) if it has crappy grey screen uniformity so, in sticking with quirky English phrases, it's "swings and roundabouts".
As for other stuff, Hisense isn't really known right now for having good local dimming so that's a plus to the TCL and I like the Roku platform they use for the "smart" stuff (apps etc.) as it's been around a while and is pretty stable. I believe Hisense use the Opera TV platform, which has been known to be buggy at times. If you're moving up from 1080p, both will blow you away with a 4k source just because of pixel density so what you really have to pay attention to is black levels (which is what local dimming helps with), color saturation and HDR brightness. And it'll be tough to gauge that in a store because they don't put entry level TV's in a dark room (or any of them, at Best Buy).
Considering you're asking on here, I've probably freaked you out now...so I'll cut it short. Eyeball them as best you can. If you think the picture's equal, I'd go TCL. Everyone's different, though.
¯\_(ツ)_/¯
You're welcome,
Unhelpful Rob
