@Carnov
If you have no interest in any "3D gaming" then your best bet is the Pi 3B+. It's extremely reliable and the support is outstanding. I can get nearly all systems to run quite well, up to and including, Playstation 1 emulation which was considerably more powerful than any 16-bit console up to that point, barring a couple. If you're planning on emulating systems like the NES, SNES, Genesis, Master System, etc from the late 1980's to the mid to late 1990's then the 3B+ will do everything you'll ever need it to.
Like I said, the support for this model is outstanding here. I have nearly zero knowledge of the intricacies of any version of Linux and I was able to get the OS installed and my system running with very little trouble. Just make sure you follow the instructions. All systems after installation will require a period of time for you to acclimate yourself to the OS, RetroArch, Emulation Station and the many settings and options you'll have to browse and fiddle with to get everything right where you want it.
Each game can have custom options through RetroArch and the amount of control given to the end-user is fantastic. I truly commend the RetroPie team for all their hard work.