I researched the heck out of this, and ended up doing nothing.
Racedeck (look for similar competitors at lower prices) is awesome, but unless your garage is for your showcar that rarely goes out in the rain or snow, it will be a pain to clean and you could have issues if water gets under the tiles.
Epoxy is a nice solution, or a cement stain, but to do it right, (solvent based with acid etch) it isn't easy,and it could become a maintenance issue if it starts to peel up.
I almost went for rollout flooring, I found it attractive, and the ability to sweep water off it was a plus, or pull it out of the garage once a yr to clean,etc.
check out...
Coin Pattern Roll-Out Flooring from Better Life Technology
Ceramic tile is another nice solution.
I just cleaned up the cement real good with chemicals and pressure washing and it looks nice enough for me.