I don't really have any recommendations for the brand. I have used the kits and I liked it. The prep is the biggest part of the job. Make sure that the floor is I MEAN CLEAN! Oil, dust, wax, water(moisture), will cause this stuff to fail miserably. It's best to have 2 people because it has to be used within a short time after mixing. Put it on thick so that you don't have to re-coat it. One of you should start edging as soon as you get the paint mixed. The other should start rolling it on as soon as you get an edge to work from. Buy a gallon for each garage bay and put it on thick. Plan your job before you start and know where you will end it. Roller pans are a pain when you are painting a floor like this. Get a 5gallon bucket and a paint screen, also get a long handle for your roller frame. The length of a broom stick is just right. Then you can just dip your roller in the paint, roll the excess off on the screen, and roll it on quick. I scoot my bucket along with me with my foot. That speeds the job up considerably.
Tom in KY, You will be pleased with the way it looks for years.