its true because i see there is many people get success with cloud mining and the two cloud mining you mention is a good company. they have been online since almost more than 3 years ago and until now, they still paying their members. i think its good to join with them but you need to thinking how much you want to buy the hashrate. i think i am prefer with genesis-mining because in genesis-mining, you can have several option for mining and not just mining bitcoin.