Depends on what you do in your garage besides store things. I have a workshop on one side of a large detached garage. 15 foot high ceiling, loft around the perimiter. All walls are sheetrocked and taped. I masked and covered to paint three different colors. I used interior semi gloss paint because I needed to be able to clean the walls easily. I use saws and grinders, and other things that create bad dust sometimes.
I only use Benjamin Moore paint. The paint from the box hardware stores is very poor quality in comparison. You get what you pay for. Benjamin Moore makes paint that is easy to apply, has few problems with drips, runs, holidays and marks, and it is extremely durable. For the sink area I used gloss Impervo oil based. Impervious to just about anything.