I chose to learn both at the same time, and would recommend it if you're willing to buckle down for a month or two of frustration. I really feel like I further developed my ability to go head first into learning in a way I had in the past. Still learning a lot though about both. I should mention that I'm a freelancer; if I was an employee it might be hard to get a way with spending so much time learning rather than producing in the short-term.