Out of the mining and trading I will prefer to use trading for the earnings purpose .
If you have the cheap or free electricity then I will suggest you to made the mining as the income source in your life but probably in the most of the countries the electricity in not cheap , so most of the people are using trading job for income .
Here trading needed to get study in better way and also need experience of one to two month that how the system of the trading ( day trading , Bitcoin only trading , altcoin trading ) is working and how to choose the better coin for the investment .
All will depend upon your experience in this field .
If you started the trading then I will suggest you that never get panic of down in the price and don't sell until you get profit .