What is the difference between Lifetime contract and 1 Year X11 Mining contract

[grambel]

I've recently recorded in genesis-mining website and I bought 50gh/s Lifetime contract

But I heard that 1 Year X11 Mining contract better than Lifetime contract

I want to know What is the difference between those contract

I need a demo to learn how I calculate the expected revenue from the contract

Thank you so much

[ivanst776]

May we know for which "cloud mining" website are you talking about and about the question you should find in the website how much Gh/s does this X11 has.

[IanFoxley]

Would be much better to have these sorts of questions answered on the official Genesis Mining thread to be honest.

https://bitcointalk.org/index.php?topic=602022.0