Maybe you can also specify what kind of coins are you trying to mine, or what device you're mining with. If you're planning on using a phone or a laptop, and hope for a decent profit, I'd suggest you try your luck on the lottery instead (as mentioned above). You said somebody asked you this so I assume you're just trying to see which platform is good that you can recommend to him, but I'd rather tell him to research it on his own, especially if you don't know what kind of device he will use to mine. Just tell him that most cloud mining is scams and if profit is his goal, he'd need to spend a lot of capital to build a decent rig. CMIIW.