fangs- Being that you are in the Northeast I'm guessing you have rain and snow. One of the problems with an epoxy floors with a glass shine is they get VERY slippery when wet. I watched a pro do it and he took handfuls of sand and threw it onto the freshly painted floor to give it some grip. If you intend on having it as a working floor one of the hazards is tools dropping at height onto it, like a crescent wrench or a screwdriver tip. I'm not saying all but most inexpensive epoxies will chip due to the impact. As others have said prep is everything, you will want to spend twice your time on the prep, if you think it (
oil, cracks) will be a problem it will be. So if you have the perfect floor with no cracks, water issues, etc … Then epoxy is the way to go. If you have any of above issues go with the tiles. Tiles ahve their issues also. You can't slide under the car very easy, they don't like hot things, they takes some time to cut correctly so the wall edges come out, small caster wheels don't like them....