it depends if you are legendary or you bought the dlc if you are legend use the quantum and if you bought the dlc choose you because the two are very alyke, it depends on what you like
go quantum man, is much funner, I'm a mental guy, but I've always wanted to try quantum, the tunneling is beast, the power that lets you freeze your enemies in the air is beast, the fact that it came out with Origin Crisis DLC, it just BEAST.