You can use either but I would recomend open gl for a 3dfx card.You could also try the 3dfx mini driver that is also available in CS. Best to try all and see which one gives best results.
But of the two use OpenGL, Halflife is based on the Quake2 engine which was OpenGL only, Valve added D3D, but OGL is native to the engine, so I'd use that.
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