Couch coop TV requirement is to get the biggest TV within your budget. PS5 Doom in 120 fps would be nice but not with the U7G, at least the international version.

If you have the budget for a 65" X90J, then go for that.

Hisense 2021 lineup is not for the high-end 4K market. They left that to go with 8K TVs and I don't know if that strategy is working for them. The U7G is for the mid-end market, for people who want quantum dot, FALD panels but not pay through the nose for it.

Many professional reviewers have said that X90J have better color accuracy out of the box. For average users, they won't know the difference. Most TVs sold at retail, including the big brands, are set at the Dynamic mode as their retail mode. Most users who set their TVs at home seem to prefer the garish dynamic look.

The X90J has better color accuracy. It doesn't have the quantum dot filter, which means it doesn't have a wider color gamut, for forever. You can't retrofit the quantum dot filter to it. The U7G has WCG out of the box. You can get the U7G professionally calibrated but...

Most people don't know that calibrated TVs are meant to be watched in dim rooms, something not practiced in most living rooms. They also don't know that it's not a one-time thing. In professional settings, TVs and monitors for film/TV production work are meant to be re-calibrated every 3-6 months. If  professional equipment needs recalibrating, consumer grade equipment needs them too.

So what does this all mean? If you label yourself as demanding color accuracy, you need to tinker with your TV. Get a colorimeter - they usually come with the proper software -, find out your TV's secret menu and calibrate according to the schedule. If you are just an average user, you can use the AVS HD 709 videos and a blue filter to calibrate your TV.

If you just care about brands and models, then a mid-end Chinese brand is definitely not for you.

U7G - FALD with 60Hz VA panel
X85 - non-FALD 120Hz VA panel
X80 - non-FALD 60Hz IPS panel

Look at RTing's comparison of X80 and X85.

If you're going to game a lot, like 80% of the time, I suppose the X85 for the 120Hz panel. No game, PC or console, will have enough GPU power - as of 2022 - to give you high-res texture and ray-tracing that you would get when gaming at 1080p/1440p at 120Hz.