PS5 2020 (First Release) or PS5 Slim?

I want to buy a PS5 but which one? I'm scared that the PS5 Slim will overheat and will break, I also want to lay the console's, and I'm not sure if I can lay down the OG one. The PS5 OG is Cheaper. Do they have the same graphics, and performance? It's pretty important for me, also does the RDR1 have 60 FPS on the OG One? that's also really important for me. What do you guys think?