I don't care either mate, but just had to pull you up on what you said as it was wrong.
Your benchmark scores would improve, they would not get worse by switching to a 5950X. I was not making it a GPU benchmark competition which is how your post reads to me so I guess you got the wrong end of the stick.
Would the CPU performance uplift of 5%+ be worth it? Probably not for most people, but it depends how important 'maximum performance' is to you. If you like benchmarking as you indicated, then every little helps.
A 5950X would make your 3090 even faster than it already is on water cooling and with a 500W BIOS, so please stay with Intel. I truly hope you stay with Intel, as it's going to be easier to try and beat your scores when you are using a slower CPU.