forget mining, it's not worth it anymore as it was back in the days. A couple of years ago you could earn 200 BTC by mining for a couple of days, now since everyone is trying to mine, mining has become unprofitable for the amateur miners. It has become a real multimillion dollar business that only big level players can compete and that way it has become difficult due to the difficulty level has increased. The most profitable coin if you still want to mine something is to mine something that no one else is mining. That should be something that not a lot of people are mining which will hopefully put your computer processing power in good use. You have better chances of making a profit by simply purchasing the coin right away from an exchange.