yeah the robo.
IT's just better mechanics.

And nothing that make s a huge difference to an i3 has changed in the last few years. I believe prusa is still using 8bit boards on the mk3.

What you need to bear in kind is that the ender3 design team deliberately took several steps BACKWARD in order to save money.
It might have a newer motherboard, but without decent engineering and mechanicals to back it up - you're essentially gilding dog turds :-)

(I know I know - but the creality fanboys haven't shouted at me for a while and you kind of miss it ;-)