Hi
When it comes to the NanoVNA numbers may be somewhat confusing. I for one do have some difficulties sorting one H/W from the other and even more so when it comes to the F/W. I would be surprised if I am the only one.
To be honest I am in a haze. Like me, others may revert to one particular design, not because they don't want something else, but solely because there is not a detailed overview. As indicated by others some piggybacking on brand names definitely blurs the picture.
Bo
Bo, OZ2M