Poolin was launched by the company Blockin in China. Poolin supports 9 currencies (Bitcoin, Bitcoin Cash, Bitcoin Cash SV, Zcash, Litecoin and several others among them). 20 of the world's hashrate for mining of Litecoin is coming from Poolin. Around 12 for Bitcoin and 8 for Bitcoin Cash respectively.
Slush Pool is the oldest mining pool (works since 2010) initially designed to mine Bitcoin. Currently, this pool supports one more currency — Zcash. Slush Pool has servers in many locations including Japan, Singapore, the US, Europe, Canada, and China.