I’d go with the bigger size, every time. My first flat screen was an NEC plasma, followed by a Pioneer plasma, then an LG 65" OLED. All these sat between my main speakers, which are quite large Quad ESL-2905 electrostatic panels. I also have a Velodyne 18" subwoofer up front. No center channel desired or needed.
I have six more speakers for surround and Atmos, two at the rear and four in the ceiling. I also have a pair of KEF Reference 1 speakers which are alternatives to the Quads (they play louder!) and fit between them. The seating is a 3-seat lounge where the outer seats recline.
My partner has a more modest set-up, but has the same size 65" Sony OLED TV between KEF LS50 speakers. plus a sub and two rear speakers. Her chairs are individual recliners.
I’d note that all the speakers I have mentioned by name are designed to emulate point sources of sound and have excellent imaging, which is one reason no center speaker is used.
These systems are in the main living rooms in our respective houses, and fit into a space about 16 feet wide.
The price of TVs is certainly falling! My first LG OLED developed a vertical line after about 5 years, and LG eventually agreed to a full refund. I bought its successor and had half the refund left over! I'd also take OLED over the current alternative panels every time. Look from increasing side angles and the reason becomes obvious.
If you have the chance, go to an IMAX theatre and ask if the screen there is too big! Happy viewing ...