OpenGL vs Direct3D

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

Ease of programming.
Direct3d is better here if you use a bare-bones OpenGL. They are about equal if you use decent additional libraries for OGL.
Keep in mind that OpenGL is more low-level than D3D and has different goals, so this comparison isn't really all that interesting.
Performance.
OpenGL wins here, no contest. Especially if you know what you're doing.
Amount of cocks
Try writing a game for the PS3 in D3D and you'll notice the huge cock that is vendor lock-in.