I consider myself a cloud mining expert (Meaning: i lost a lot in cloud mining
).
I use CEX, HashProfit, Hashie, Zencloud and Cloudminer.io.
The best so far with decent payouts has been hashprofit, probably due to the fact that there is no maintenance fees AFAIK. CEX is a big washout for me, lost $600 there. Unless you are into trading GHS, no point using CEX as their maintenance fee effectively puts paid to any profit you may make. Hashprofit KHS cost quite a bit though and i do always have a nagging feeling that they could pack up and disappear one day. TBH, i do not suggest cloud mining due to the fact that ROI is not very achievable considering the current maintenance fees and the price of Bitcoin. Since most of them charge maintenance fee in fiat and the value of BTC is lower they will eat up most of the mined BTC as fees. If you decide to go for them still, good luck to you!
P.S. If you wanna use Hashprofit, PM me, i have a few suggestions.