Ask HN: c++ or iPhone?

I am trying to make a decision on whether to pursue c++ or iPhone programming. I have been a contractor for 12 years working mostly in corporate microsoft shops doing 3-tier programming. In today's environment, I want to gain a more competitive edge so I'm trying to figure out how best to improve my skill set. I like c++ because it is in high demand and it is the language that separates the men from the boys. I like iPhone because cell phone programming is going to be a large part of the wave of the future. As far as "following my passion," both are equally exciting to me, but I need to fully commit to one or the other at this point in time. What are your thoughts on this?