If you are looking for an exchange that offers high liquidity and security, I recommend Fatbtc. Fatbtc is an Hong Kong cryptocurrency exchange. It supports some giant cryptocurrencies and many altcoins. It also supports it's own its own Currencies FCNY and FAT although they are not popular outside Chinese territory.
The exchange has an easy to use platform that offers many analytical tools like price chart, indicators and historical data for forecasting etc.
The exchange supports bank wire and credit card for transfer internationally. It also accepts transfer from local banks in China. Its website is available in multiple languages which make it usable for citizens from other countries.
Transaction and assets are secured with 2 factor authentication and HTTPS protocol. All assets are also saved on offline storage.
An Exchange like this will really provide traders with enough liquidity considering the number of cryptocurrencies and altcoins supported. It is also recommendable for it's security. The exchange has never been hacked from inception till now.