I think is a personal choice. I don't need to make a list. I simply changed to both performance modes and immediately game looked like last gen for me. Returning to Fidelity made the game to looks like next gen again. I can't explain why, but I felt it instantly.
There definitely is a difference.. and I wonder , since I have a C9, how much the drop in resolution is noticeable depending on the TV. There are some people who insist playing in game mode is a stupid idea... some people with sharpening filters turned on.... we'll never know. But I do know there's a big difference in sharpness , especially noticeable with Ratchet or Rivet between fidelity and performance RT. The motion blur application makes 30fps feel ok (not ideal obviously but OK) so I prefer that mode. I play PC games on a 144hz monitor. Play Fortnite on PS5 on 120fps mode. But this game is all about the looks for me... and locked 30 is totally fine.
I wouldn't go as far as to say any mode looks "last gen". That's a bit much. But maybe you're seeing the resolution drop like I am.
Started out on Fidelity to get a taste of those maxed out graphics, but now I'm on Performance RT. And yeah, it does look a tiny bit worse - in particular, the fur that looks absolutely amazing in Fidelity mode looks a bit more noisy and less defined, so it loses a little of that CG look - but the smoothness of 60fps just can't be beaten, especially in battle sequences.
I would actually prefer 60fps gameplay with 30fps cutscenes if that was an option, because damn do those cutscenes look good in Fidelity mode. They really do approach Pixar levels, and you do lose a bit of that in Performance RT mode.