Thanks for all your information. I have only used the David system and never used the NextEngine. I have been trying to get as much information as I can for the results of NextEngine scanner.
I have only reported my experience with David. I have not had the great experience that you have. I understand that if I take "a lot" of time and invest many hours into getting the right cameras, corner backgrounds, laser, Pc and motorized scanning hardware together, I might get good results. Still, unlike yourself, I have found the Fusion portion of David very frustrating, non-intuitive, and crashy. Maybe with many hours of using I could get better results.
My interest in NextEngine is that it is supposed to be turnkey. Maybe less setup time each time a scan is required. Is it better? I don't know. I do know that David is more difficult to set up each time and calibrate, etc. I also find the forum painful to use...it is often many many days before a brief, limited response is returned. I have already agreed that David may cost less, but there is a price to be paid in all the hours it takes to setup a mechanical scanner, get familiar with the software, and get good results that can be used in CNC in short order. But sorry, no bias... I cannot recommend one or the other so far....