In terms of picture quality, the R635 is better than the TCL C728 since the R635 has a Full Array Local Dimming System which the C728 lacks. This means that the R635 will beat the C728 in terms of HDR brightness, Contrast Ratio and Color Volume.
The TCL 6 Series is the flagship TV in TCL's 2020 lineup. It provides very good overall performance and is an upgrade from its predecessor, the TCL 6 Series/R625...
The C728 does have HDMI 2.1 ports and is advertised to have support for 4K 120, VRR etc. The R635 does not have HDMI 2.1 ports so it will not do 4K 120 but it has support for VRR.
There are currently no reputable reviews of the C728 so we don't know if the advertised features will work as intended. A notable difference between the R635 and the TCL C728 is that the C728 has an 8 bit + FRC panel while the R635 has a 10 bit panel. Color banding might be an issue if the implementation isn't good.
If you're interested in this TV but concerned about these issues, consider waiting a few more weeks for the reviews to begin rolling in. Hopefully these new 2021 TCL TVs would not end up like Xiao Mi Q1's false advertising of HDMI 2.1 features and Sony's X900H 4K 120 blur issue caused by its chipset that does not actually support the feature. All of these were basically caused by the MediaTek Chips inside these TVs. The present TCL TVs have also been confirmed by TCL's General Manager to be using MediaTek Chips.
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