Ethermine contributes to the same mining pool as Ethpool and this pool provides around a quarter of the hashrate used for the mining of Ether. In other words, this pool is the largest Ethereum mining pool.
PandaMiner is a cryptocurrency mining manufacturer focused on graphics card integrated miners. The GPU-based miners allow users to miner various cryptocurrencies like Ether, Zcash and many others. These GPU integrated miners are assembled with high configuration graphics cards and a tightly compatible case, professional rack and other optimized accessories for the highest mining efficiency.
Hashing24 is active since 2016. It is one of the most popular cloud mining services. The only currency mined on Hashing24 is Bitcoin. The offices of the company are located in the UK, Thailand, and Ukraine while mining farms are situated in Georgia and Iceland. Such diverse geography is needed to secure the business from changeable regulations in the world of cryptocurrencies. One of the partners of Hashing24 is an established blockchain company Bitfury. This fact is one of the trust factors for Hashing24.