Things have different levels of difficulty for everyone. The choice between to mine and to trade Bitcoins will be determined by many factors like location, what you find easy and others. For location, if you do not have a good location for mining, mining will not be easy for you because you need a safe space for the equipment, whereas you can just trade on your cell phone or personal computer that you can move around from one place to another. In a good location where many factors are met like good and affordable electricity, safety and wide space and others mining will be easier. The two which is trading and mining is to make money, decide the one you can do well after having some knowledge of the two.