Ball and Club Data
When you compare golf simulators, see what they actually measure instead of guess. Some only check the ball. Others show your club's path, where you hit the ball on the club face, and the face angle. The best ones give you full swing info, but even the cheaper ones give you enough info to help you get better.
Software Compatibility
If you want lots of courses, training modes, online games with others, or really detailed coaching, see how each one works with programs like E6 CONNECT, GSPro, TGC 2019, Foresight FSX, Awesome Golf, or the company's own apps. Some work with everything, while others only work with their own ecosystem.
Space Requirements
If it mounts to the ceiling, you’ll need extra height. If it sits on the floor, the ball has to be placed in a specific spot. Radar-based systems also need more ball flight to read shots accurately. Before you buy, make sure it works in your space and plays nicely with your net or impact screen.