OpenGL or DirectX

[Yun Peng <yunpeng@igd.fhg.de>]

Hi,

I am working on a project, which should be run on windows2000.
For this project we need to show several 2D animations in different 
windows simultaneously. The speed of the animations are very important 
for us.

Because I have no experience with DirectX. I would like to know:

1. How is the benefit of DirectX compared with OpenGL?

2. If OpenGL is better, which video card I need for it? 

2. Now I use QT for our UI-development. Is DirectX comfortable with
   QT?

Thanks for any answer !

Yun   

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