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... 
Ripple or Dogecoin lol. The problem is is there coffee shop that accepts such coin?or still bitcoin is the only option?
and also Bitcoin transaction is faster as long as there is no congestion happening in blockchain
there are so many cryptocurrency which has low transaction fee like dogecoin,digibyte,bnb,dash but instead of all these coins I'll be prefer tron because it's transaction speed is much for faster than any other cryptocurrency
Tron indeed but i will still choose Ripple instead of this.