An old but interesting interview with X-Plane creator Austin Meyer on Direct3D vs. OpenGL:
…I bet on OpenGL, and used that. As a result, here we are, 15 years later, and the people that use Direct3D can support Windows only. But, with OpenGL, I support Windows, Mac, Linux, Palm OS, Google Android OS, and oh yes: iPhone and iPodOS which are also OpenGL. So having X-Plane in OpenGL let me move over to iPod and iPhone very quickly. The port was done in 2 weeks, to be very exact. And you saw that i have moved 500,000 units on the iPhone and iPod since. I get $7 from each of those sales, and have moved 500,000 units in the last year and a half, so get out your calculator, do some math, and see if i made the right choice to bet against Microsoft 15 years ago.
Always bet on standards. Nobody remains on top forever. When you bet on proprietary tech because it’s in the lead, you’re betting that your demise will happen prior to the leader falling. Never bet against yourself.