Different models' specs can be compared here: https://store.google.com/us/magazine/compare_pixel
I personally have the regular version of my year's phone. The only reason I wish I had sprung for the Pro is I would like a bigger screen. My phone, which is not a Pixel 8, is great otherwise. It's not slow at all. No complaints.
I think that if someone isn't playing super hardcore games or using their phones for something that needs a lot of RAM or processing power, either phone would be fine. The rest of the differences can be compared in a store. Just play with them and pick your favorite.