Welcome!
The differences are mostly just design choices. AFAIK VzBot designers aims for higher print speeds, while Voron designers aims for reliable prints, while being reasonably fast. Remember that there is no perfect 3d printer, every one of them have their strengths and weaknesses, and experience will teach you to identify them.
However, whatever is the DIY 3d printer you choose, you have to keep in mind that they are as good as you build them: there are many cases of people complaining about their printer's quality, but they never tell about the shortcuts taken while building because they got lazy. I've seen a fair share of sloppy builds that could never do a good print.