If you're not going to do any work on it, it kind of depends on your taste, time frame, & tolerance for cost. At the low end of the cost scale is simply seal the concrete, or paint it. You'll have to wait for drying before driving on it, but after that it'll clean easily & look good for years. You'll have to use a good quality paint to avoid hot tires pulling it up, but that's easily done. After that I'd look at getting samples from various suppliers. Most suppliers will quickly send a sample of their flooring & it gives you an idea of the feel of the flooring. I chose Racedeck style tiles as a quick, reasonably priced, way to cover an older cracked & damaged floor. Since your garage is new you probably don't need to hide old wear & tear.