Like Fritz mentioned, it depends on your ceiling height.
I am not a big fan of the infra red as you cook one side while freezing the other while working.
I have a Reznor low profile unit heater in my garage. It can be mounted within 1 inch of the ceiling (drywalled) and the unit is only 12 inches deep. Can be vented horizontally or vertically. Works great and is far above fuel fumes or the like that have a tendency to ignite while pooling on the floor... You still want to turn them off while painting, using solvents or working with gas.
One of the positive things about the infra red is that they put heat into the mass of the building (floor) and objects in the room.
https://www.rezspec.com/catalog-udap.html