It's horses for courses. For general video stuff I'd put in a Decklink Extreme. However, Martin correctly points out, there is some impedance mismatching on the SDI input. This effects long SDI runs. This can be fixed by putting an SDI DA before the video input, which will reclock the SDI.

If you are only going to use SDI, then either the bog standard Decklink or an Aurora Pipe SDI are your cards of choice. You can use them both together for dual SDI video input. The other advantage is that both cards have deck control, so if you need to control RS422 devices, this is fairly effortless.
Hugh