Generally build quality and repairability. Any IT department will favour devices that can have common failure points (battery, SSD, screen) replaced with a single screwdriver, and with that comes the need for stronger chassis and modular designs because you can't rely on glueing everything in. Also, with the exception of Apple fanbois, IT techs are quick to condemn manufacturers who let pro grade kit standards slip, which could mean a few years of lost sales.