OpenGL & DirectX

Alright, so this isn't a "which one is better" thread. I've been experimenting with both and kinda go back and forth between liking the two. DirectX I don't personally like (atm at least) cause you have too set up Vertex buffers and shit from the very start which isn't exactly useful when you're just trying to hack program something together.

Anyways my question is what reason(s) do you guys have for using either one for your programs?

I want to use OpenGL for the openness.

In truth, I'd want to design something in OpenCL, if it can do the same functions as OpenGL/GLSL

Simple reason?

OpenCL is more cross-compatible, any OpenCL card will run it - and there would be far less deprecation that OpenGL/DX, which is a major issue with older software. (I'm not sure if Windows 7 even wholly supports D3D6 or DX7)

An OpenCL-type engine is what Epic Megagames, and possibly Id is aiming for, as the more we abstract and complicate what we want to do, the harder it is to keep a "standard" graphics library.