The most important thing we should know about C-Cex exchange today is that this platform is currently not active. The exchange has suspended its services on June 1, 2019. The website is down, too. Those who didn't withdraw their assets from the C-Cex account cannot do that since June 1.
Bitfinex is one of the largest exchanges in terms of daily trading volumes and overall recognition. It was founded in 2012 and it is based in Hong Kong. 72 trading pairs are currently available on the platform. The pairs are linked to the four currencies including USD, EUR, BTC and ETH.