Both are clearly different things. When you decide to commit mining you are entrusting yourself to buying some hardware to commit mining to the coins you trust, while bitcoin investment means you are trying to buy Bitcoin to sell and buy. Oh yes Bitcoin investments can also be said much wider because we are free to do it anytime. But in overall then both have a high risk, but if you look at the ease of doing Bitcoin investing much easier. Because when we do mining we must be required to master the skill to be able to design the hardware and do some setting of the program to do the mining. You may need some time to get used to it. The most important thing is that you do the right thing with the expertise and also the comfort, for me it is important because then we can enjoy in mining or investing Bitcoin.