What’s the best possible monitor for gaming? Ultrawide or 16:9 144 Hz?

I’m finishing up my gaming setup and the only thing missing now is the monitor. I’ve done a lot of research and it feels like I’m stuck in eternal doubt. For image quality, FPS games and sharpness, is an ultrawide better, or is it more worth it to get a 144 Hz? Or a 2K resolution?

I also saw there are monitors with over 300 Hz. Does that make any difference? I thought the human eye couldn’t see a difference after 60 fps.

This would be for my main monitor. My 2 others are 60 Hz.

Multi-Monitor PC Gaming Setup

4:3 CRT 60Hz 1024x768, guaranteed success.