The best is Crypto Bank. I was not really good with understanding numbers and how this works, but since the system is running in a smooth pace, with no or just seldom lags. The customer service is fantastic. Transparency and speed are key features. Coins arrive in your wallet in 30 minutes or less, which is a one-of-a-kind feature. Guys, keep up the good job. I am excited to sell coins to Crypto Bank as well.