OpenGL or Direct3D?

I've been thinking of making some sort of 2d game with little 3d maybe, but I'm not sure which is better/easier to learn: OpenGL or Direct3D. Can someone clarify me what are their strong/weak points, or which is generally simpler or easier to learn, cause I'm not going to do anything big.

>>9
Speaks the truth of someone who has programmed in win32.

Actually I've used DirectX myself and it's not nearly as bad as win32. I'd still choose OpenGL though because I don't want to add myself to the heap of schmucks who indirectly work for Microsoft by sponsoring their platform lock-in tactics. If MS wants me to work for them, they can pay me. If they want me to use DirectX they can make an open, freely licensed implementation. Otherwise no.