The GT-Shadow has a lot more "advanced" settings, and really is aimed at more experienced traders. You can run it on two currencies at once and hedge against each other, change the grid settings, change the lot size settings, and so forth. If you're a new user, you would probably be better suited to the RoboMiner, and then after learning how to use it and becoming more advanced you may want to consider getting the GT-Shadow.
Basically, it's not designed for new users.
