The best trading sites from my point of view are coinbase and bitrex coinbase is great for using platform top notch knowing huge fees and rates don't take the simplest the list of supported countries is extremely short so it doesn’t work for everybody. An exchange with the longest list of cryptocurrencies supported by bitrex one among the most important players within the market also some reports on internal work are often found online. I'm unsure if they're correct but there are many compared to other exchanges.