If I had the choice/opportunity…
On top of a work shop area and a small en-suite (toilet/sink/shower) enough room to park two cars and open the car doors to get out without struggling. Trussed roof for storage, couple of ground anchors in a polished & sealed concrete floor, automatic/electric garage door, side door, main lighting, work bench lighting, electrical sockets both sides of the main door and spaced around the garage, internal garden tap near main door, security lighting and alarm.
Then fit it out with boys toys, industrial shelving, secure storage for your cutting tools that could be used by un-desirable people who want to steal your possessions