Steve, my friend you have asked one of the biggest debated items on this site.
Interior wall coverings. You will see a wide array of posts for and against each one. Take each post with heed and follow the building codes in your area (if you have any) especially if you have to get your garage inspected.
Drywall, meets code and fire resistant, labor intensive to hang/finish, looks good when finished yet susceptible to dings and dents. If you live in an area with seasonal temp changes, an unheated/cooled garage drywall joints may crack.
OSB doesn't meet code and will burn. Hangs just like drywall, yet joints don't need finished or may be caulked to look seamless. Resistant to dings and dents, and some people say it's easy to hang "stuff" on. Some people do not like the slight wavy appearance.
Plywood shares many of the qualities of OSB, but generally at a slightly higher cost. Smoother finish than OSB.
Metal siding can be bought in a wide array of colors and various lengths. It's available in corrugated or "squared ribs" ribs like a pole barn.(for a lack of better term) Gives a clean appearance when completed yet can be difficult to find a smooth surface to hang shelving on. It can be dinged and dented but does provide some resistance. An interior covered in metal siding may have a tinny echo and/or no noise absorption.
Those listed above are generally some more of the prevalent choices here on GJ, but not all. Some others have used other materials like Hardi-board or had a metal bldg just spray foamed and left as is.
While I may not be totally correct above, I have tried to provide an unbiased opinion of the most popular choices and pros/cons. Take it for what's it's worth and enjoy your garage. Feel free to post up a thread in the gallery.