Negatives to porcelain are that it may be extra slippery when wet than other floorings, and the grout may become filthy if not adequately sealed. This means any leaks or spills will possible remain unless the garage flooring is professionally cleaned. The aesthetic Gains must be weighed against practicality. Idea: https://mcgepoxycoatings.com/epoxy-vs-untreated-concrete-garage-flooring-which-one-is-best/