So what's the best coin to buy a cup of Coffee with? Transaction cost must not be expensive and the transaction must complete before the Coffee gets cold... 
tron is very fast for transactions, does not need to take a long time, the fee is also very low, many people prefer TRON because it is fast transactions if you only buy a cup of coffee for payment can use TRON because it is very fast and makes it more efficient if you are in a country that receives crypto currency then you are lucky because it is faster and easier. Dogecoin is also a good choice if you want to buy a cup of coffee.