I look forward to the day when the answer is - NONE.

That said, it's a great question. Especially when the heat and humidity ramps up in Florida. That said the cloth ones seem to be the worst in terms of keeping heat in. Disposable ones probably would be good in the parks and seem to allow you to breathe most normally - though aren't the most fashionable

I say, do the sunglasses test. If you are wearing the mask and a pair of sunglasses, and they fog up too much - that's not a keeper.

Others may have better advice. I'd say some of the gaiter ones that are microfiber - but disney doesn't allow them.