Interesting thread, with a lot of great info.
I was looking at both and decided on a 5820K/X99 for my current Linux build. My use is similar to what Tecnoworld said for his: photo editing (darktable,lightzone,gimp,shotwell), video editing (Pitivi, OpenShot, Lightworks), and some audio work. Also web research (50-100 open tabs). No games at all, just a media work machine.
I'm looking at 32GB RAM, a 500GB SSD for the OS and media libraries and 5TB user data -- I'll need the drive space! But I do have a budget and am trying to keep costs down. Right now I'm looking at the ASRock X99M Extreme4 Micro ATX LGA2011-3 motherboard but am open to anything that's lower cost and still good for my purposes. And I have no idea which GPU to go with. Gaming is a non-issue, this is just for photography and video and needs good open source support.