Buy the Hisense 55-Inch Class U6 Series Mini-LED ULED 4K UHD.

Better backlight, more HDR formats, and it costs $210 less than the TCL.

What was compared

1. Deeper blacks the TCL can't fake
The U6N runs Mini-LED with Full Array Local Dimming, a real backlight upgrade over the T7's plain QLED panel. That means darker night skies and cleaner contrast in movies, not just a brighter number on a spec sheet.
2. Same TV job, $210 less
The U6N lists at $239.99 against the T7's $449.99, nearly double for a panel with no local dimming to show for it. That gap buys you a soundbar or just stays in your pocket.
3. HDR movies render right, TCL's may not
Hisense confirms Dolby Vision IQ and HDR10+ support on the U6N. TCL's T7 listing names neither, so Netflix or Apple TV+ titles mastered in Dolby Vision may not display as intended.
4. Ratings you can actually trust
The U6N has 908 ratings averaging 4.3 stars, a real sample size. Research on TCL sets flags recurring complaints of freezing or failure after the warranty window, a pattern the Hisense listing doesn't share.
5. 144Hz sounds bigger. It rarely fires.
The T7's native 144Hz beats the U6N's 60Hz-plus-motion-smoothing on paper, but almost nothing you plug into a living room TV outputs native 144Hz 4K. If you're a PC gamer with a card that can push it, grab the T7. Most buyers never see that number move.