I think this is kind of impossible to answer. The builds are quite different and perhaps have different goals. I think many printers are over-designed and under-engineered. Many have mass where it isn’t needed. You can make a very capable printer more simply.
Having said that, I have updated most of my printers from the original GridBot 2 design to one I call 2.5 – it’s not as well documented, but the CAD model is posted in the forums.