Panix: ATI doesn't support new kernels/xorg-versions as quickly, but: do you really need that? You said you don't want headaches, so are you going to use bleeding-edge-versions of anything? "Stable" distros don't just use new kernels right away, either.
ATI takes care to support kernels and xorg-versions that are used in releases of their supported distros - if you pick one of those, fglrx will support the used kernels soon enough.
In short: if you like bleeding-edge-distros and frequent aggressive updates, stay away from fglrx. Otherwise, it doesn't matter much.
Video is a different issue. If you need hardware video decoding, you need either VDPAU (nvidia) or Xvba (ATI), but neither of those works out of the box without installing additional software or git versions. The nvidia-solution is more mature though.
Without hardware video decoding, fglrx has two xvideo-bugs: no vsync and slightly washed out colours. I still use xv because they don't bother me, if they bother you then you'd either need to get xvba working or use opengl-output.
xv with nvidia doesn't seem to have vsync either (although nvidia-settings claims it does), but the colours are correct. But sometimes, it takes a few seconds to switch to fullscreen for no apparent reason.
video *editing* should be unaffected, at least on linux. The editors I know work in 100% software anyway.
For your use cases, nvidia's drivers are currently better, but that doesn't have to stay forever. If you're planning to keep the card for 3+ years, I'd personally bear fglrx for now and wait for the OS drivers to mature - in fact, I did. fglrx introduced a few bugs, a few nvidia-specific bugs went away, altogether I'm happy.
I don't know what distro you guys use, but for me, there's a whopping difference between
~> emerge -av nvidia-drivers
and
~> emerge -av ati-drivers
Usually both work.
the "superior hardware"-tag also includes less power draw at the same performance, which is readily available without software support
I think you're over-focusing the *current* state of affairs. Which is ok if you buy a new card every couple of months, but short-sighted if you keep 'em around for years.




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