Hashflare is a confirmed scam, first of all. They reduced the length of customer contracts from lifetime (which wasn't really lifetime in the first place, as when profits didn't cover maintenance fees, they would terminate) to 1 year, without consulting any of their customers.
Genesis is probably legit, but nobody says they can't be doing fractional reserve mining. Even though they probably are mining there is no guarantee that they are paying out the right amount, or have the promised amount of miners working. The contracts based on most reviews are definitely not profitable by any means.
Bitforx is new, and unfortunately with no history I just wouldn't trust them with that much money. Plus, there is no reason that they will perform any better than their predecessors.
Just avoid cloud mining. History have proven that it is unprofitable and that's not even mentioning the risks of them running a ponzi or just scamming you.
I completely agree with you about BitForx being new on the market and it being risky from me to get involved with them, but they seem to be stable and profitable, at least for me now! They are very customer friendly and attentive to all the details and remarks from me, so as far as I know I'm comfortable working with them, I get profit and my 2 year plan looks pretty stable to me. I invested when BTC was 6,8K and I can clearly see the profit now.
I repeat, cloud mining is not for everyone and as for cloud mining service providers being scammers, I have checked their mining farm, contacted their head office and even spoke to their CS representative and everything seems legit. so far so good!