Honestly, if you are using the card primarily for 3D graphics, you really won't lose out buying a product from either company (or their partners). The features that really set them apart are used 99.9% only by games, and mostly as marketing talking points. For 3D previews, cards from both companies will suit you well. Both have stable drivers (with ATI finally catching up to nVidia, more or less). The best decision is to get the best card that you can afford - each brand has many cards at various price points. Spend what you can and enjoy the card. If you plan on using it for games as well, I would lean a bit more to the ATI over nVidia. Otherwise, check them both out.