Wayne, I'd go with urethane topper if it fits in your budget. Epoxy, even when done right can "pop off". If you heat shock it, like if you're starting a run in the morning and just don't feel like handling whey all that carefully and want to dump it, it's not the best thing for epoxy. Or, say, you are doing hygiene control and steaming the floor before cleaning it. Can fail in certain situations. And epoxy also doesn't last as long. Personally, I'm a fan of spending more up front and not dealing with it later. You don't want to have to recoat and move your vat and everything else around later.