As stated earlier, you’ll struggle to find a 120 Hz signal for sports. By the time it is available, there will be new generations of TVs. Focus on the color quality. In a dark room, getting true blacks from OLED makes a difference. In a bright room, the difference is negligible IMO.
If you end up with a cheaper model, just get yourself a separate streaming box and it’ll be fine. Personally, I don’t like any of the manufacturers menus anyways even if they have the power to not be laggy. I like the Apple TV to make switching between apps smooth to jump between TNF and CFB without closing and opening the apps.