In short: HashFlare looks more profitable than others, looks detail below.
I have made comparison table for 3 main well known services of cloud mining to make it more easy for you to choose.
These services are:
HashFlare
Genesis-Mining
Hashing24
Detailed table from Excel:
https://qph.ec.quoracdn.net/main-qimg-07c1ca1cd94af821014a3b6cf7b0e9a3
General information:
All 3 services contracts are lifetime, what means that they will work until the cost of mined coins is higher than maintenance fee.
If profit became less than maintenance fee, HashFlare will continue to work 21 days, Genesis-Mining- 60 days, haven't found information about Hashing24 in such situation. But this situation can happens only if bitcoin will fall more than twice in price while it's difficulty will stay same, that doesn't looks like much possible in near future.
You can use your bitcoins or debit/credit cards to pay for services.
HashFlare LiteCoin mining idiomatically convert income to bitcoins, that why it placed in the same table with bitcoin services. It now a bit less profitable than was before, but still interesting idea to diversification investments.
General conclusions:
If you want to try with minimum size investment - your choose is HashFlare - their contract is just $1.2 cost.
On longer time Genesis-Mining looks most effective because of less maintenance cost, but in long time perspective difficulty of mining will increase and it looks better idea to buy more power on HashFlare and win in shorter time distance.
If you want more diversification, than you can use Hashing24 as well.
PS: Don’t forget, that crypto-currencies have volatile prices and therefore are quite risky investments. Mining difficulty increases and mining becomes less profitable over time. Don’t invest more than you ready to loose in the worst scenario!
so if you want to try can go with this link : https://hashflare.io/r/3C7E1FC1