Those are great things to test for precision, the scopes are so good that they will all test well. I agree with Volker on their points. Testing as many real world samples is important. Try different imaging scenarios, scan methods, push the speed, check sensitivity, try dim and dirty samples, cells, tissues, thick samples, poorly prepped samples. System stability is a big one, image the same sample over a few different days. If timelapsing, focus performance, and repeatability of the stage. How complex is the software? A really BIG one that is often overlooked is managing the image files that some off of the microscope - are they easy to work with across platforms (e.g. Fiji, Imaris, other). It can be a real issue generating 100s of thousands of image files and then having to deal with it. It cannot be stressed enough about the service aspect, many microscopes are great, some may do a few things another doesn’t, and vice-versa - but living with the microscope and dealing with point of contact rep and service will become very important. Upgradability of the microscope, fees to update software, can you purchase additional service contract beyond a certain number of years, etc. Good luck and have fun!