All depends on how you are going about the two situations. Mining has pros and cons. One of the big things going against mining is how expensive it is. Miners can be a few thoughts dollars, as well as the electricity and power to cool the machines. However if you are able to use someting like solar power to run it, you can significantly increase your profits. Trading you will probably never get the best price however there is overhead for running the miners or anything of that nature either.