P755 looks inferior in the sense that it does not have built in Chromecast (if important to you), has little low brightness than C655 and likely a bit duller colors as it has lower contrast ratio.
Both have 60Hz refresh rate, not higher like 120Hz but it does not matter if you don’t play PS5 or computer connected games that go at 120hz (most games are 60hz).
You will have to see both side by side to make a final judgment, visit any TCL center or a big electronics shop to get an idea.
If you feel the difference is not huge you can save the extra 1 lakh.
If one does not have budget issues I advise getting the Mini LED TVs as they have significantly better brightness, contrast and general picture quality. Like C855 and C755.