I've voted Darktable, since that's what I primarily use for raw image development.
However, whilst I applaud your poll thread, I'm not sure the range of choices is wide enough. For instance, I also use GIMP 2.8 for image editing as the next stage of my workflow. Then again, sometimes I use a GIMP add-in to bring a raw file directly into GIMP (especially on my lower-power machines). Plus, I use digiKam for library management, and that too has quite a capable photo editor that handles raw files. Occasionally I use that facility...
But, for the purposes of your existing poll, I'll stick with Darktable