Interesting debate. Obviously you want a high end GPU And an OLED! As someone who has both (3090), if I had to choose an either or, it would be a tough decision for me for various reasons.
GPU horsepower is always more important... the difference between a 3060 and a 3080 is literally double the performance and that is worth far more than the upgrade from an LED to an OLED. A good LED IPS may not be up to OLED standards, but it still lets you see and experience the difference in visual fidelity and fps that a high end GPU provides.
Lots of "depends" there... obviously it's impacted running at 144p vs 4k. But if you are happy with that then all good.If you have the correct settings for the TV and your nvidia control panel in terms of letting the TV do the scaling, you should be able to happily play at 1440p and not notice much if any drop in res., obviously it depends largely on the game and your viewing distance though.
Thats why everyone is different i couldn't think of anything worse than using a 55 inch screen for games
Nothing larger than 27 for me
Gaming on a 65" OLED from the comfort of an armchair is absolutely glorious. Due to the ergonomics I only do it with games that are good to play with a gamepad, which is mostly story-driven games that were designed with cross-platform versions in mind... but for those games it is just an amazing experience. Witcher 3, Tomb Raider, Control, Jedi Fallen Order, RDR2... it's just so much better and more immersive than sitting on a desk on my 27" LED. It can hardly be compared.
For anything needing a keyboard and mouse then I am at my desk on the 27".