For refurbished desktop computers, the best purchase is usually the one that removes friction from the user's daily work. That might mean more screen space, better compatibility, easier installation or simply a dependable replacement for an existing device.
Use processor family, RAM, storage, form factor, operating system and monitor connections as your technical filter. Then compare availability, warranty and whether the unit fits your current IT standards. This keeps the decision grounded in use, not just in headline specification.