Visit their site here. Some miners available for rent include AntMiner S4s and S5s. There is not much to compare, because we personally do not recommend buying any cloud mining contracts so we will not spend the time to compare the two companies above. Grab a cheap USB miner and run it at home. Bitcoin cloud mining contracts are usually sold for bitcoins on a per hash basis for a particular period of time and there are several factors that impact Bitcoin cloud mining contract profitability with the primary factor being the Bitcoin price.