I think the coin you choose is quite good for your business but using crypto in business is not really good idea. Because not all people has interest on crypto and not many people has knowledge what is crypo and you also said only payment you want is crypo that is not a good idea for a business what if too many people want to buy but they don't have the coins you want i think they will not waste their time just to get the coins and buy your coffee. So your business will not prosper and grow.