I have noticed the difference in resolution from zz to bluebeam. It isn't terrible but it is more noticeable as I age! Any simple reason for this?
zzTakeoff: Bluebeam:


zz doesn't work directly with PDF files, while bluebeam does. zz exports the PDF files into images, that's the reason for the difference in resolution quality.
@Isaac is correct. Bluebeam currently re-renders the PDF as you zoom and pan, while zzTakeoff renders the PDF file to an image, so it is super fast to pan/zoom. We have some features we are testing locally that implement render on pan/zoom that should be coming soon.