You have things completely wrong. OpenGL is a 3D standard common to all cards regardless of manufacturer, so it doesn't matter whether AMD/ ATI or NVidia. And no, OpenGL in AE is as relevant as a pimple on your back - people work happily without it al lthe time, so your choice should be solely determined by Premiere Pro, if you use it, meaning an NVidia model with CUDA support...
I just wanted to respond to confirm that Mylenium is correct.
OpenGL is on all modern video cards. It does something quite different from what CUDA does. CUDA is only on Nvidia cards. After Effects doesn't use CUDA; Premiere Pro does.
OpenGL isn't important to After Effects.
Adobe use OpenGL in AE and Photoshop (maybe other software too ?)
ATi card are cheaper for better perf :
- ATi Radeon 6870 : 180$ -- perf : 2800pts
- nVidia Geforce 550 Ti : 180$ --- perf: 1800 pts
I think people should buy ATi's card fi they only doing AE
of course I'm speaking for people who don't want to spend a lot of money on the GPU.