OpenGL vs Direct3D

You would they fare in:
Ease of programming.
Performance.
Amount of cocks.

Direct3d is actually easier to work with than OpenGL for 2 raisons:
- Many of the helper functions you would want are already included in the library (for OpenGL you have to either write them or find some 3d engine/math library with the functions you want)
- You're pretty much guaranteed it will work for any computer with Windows installed simply because there are fewer system configurations to worry about

However I would still recommend people use OpenGL if they can  because I think Microsoft is a douche for doing everything backwards with Direct3d simply to enforce vendor lock-in. Plus you get the option to make the code more cross-platform, and can even try targeting mobile OpenGL ES devices (such as the popular i-suck-Steve-Jobs-cockPhone).