Pooling was originally owned by BTC and was later acquired by Bitmain. It has been around for a while and it is the 2nd largest pool that mine bitcoin. Apart from bitcoin, it also mine several major Currencies.
Some of the features that makes it a fast growing pool are:
1. Hash rate auto switch. This enables miners to switch between BCH and BTC depending on the one that is more profitable.
2. Minimal payout and minimal fee. Even though Mining fee and payout depends on cryptocurrency being mined, fees are generally minimal compared to what is obtainable on other pools.
3.It support merged mining.
4. It has patnership with US based cryptocurrency lender. This has enabled it to offer financial support to miners and also extend mining business to intending ones.
5. It does not use a centralized server that may limit a miner to a server even when it is down. It uses cloud cased servers, giving miners opportunity to choose the best.
Poolin is a recommendable pool for considering it's reputation with major Currencies and it's financial support for miners.