This year there were good coins for mining, my rigs has long paid off, if you have inexpensive electricity, you can normally earn. Of the last interesting for example was Zilliqa.
Currently mining coins requires large capital but with not so good results, it is only a little profitable if we are lucky to choose the right coins.
so I think it's better to invest because even though they have almost the same risk but more in my opinion it's easier.
we just need to wait for the good news and the coins we have are likely to rise.