I invested in hashflare and Genesis-mining. In my opinion both are serious but Genesis-mining is better and the contracts are longer. Hashflare charges you a lot when you ask for withdrawal, instead, in Genesis, they are not charging you...
Definitelly, I think Genesis-mining is better but I'm mainteining hashflare as well.
May I ask you to use my discount code If you ever want to invest in genesis-mining? it is Mk9bPB, just use it when you order and you will get a discount and I will get a tip as well.
Hope I helped you.
Cheers