Thank you, this narrows the field a little, but I'm surprised that there isn't a clear recommendation for an external monitor specification that delivers crystal clear text like the Surface Book does.
From further research it would appear that the fuzzy text is a known issue to do with scaling.
It still seems to be a process of trial and error, surely someone at Microsoft must have a configuration that provides a crystal clear display with pin sharp text. It would be great to know what is actually recommended if buying a new external monitor.
If purchasing a new 4k monitor will provide pin sharp text then it would be great to know, or is that still a compromise? Thanks