I fixed the link... Although Alternate is quite the expensive website...
As for the reason I would pick the R7 370 over it, is because of the features. The performance difference is small between the two, but FreeSync is taking off, with a bunch of monitors being released next year. The GTX 950 is indeed slightly faster... But you can have a 4GB version for 2 euros more, and well, 2 GB is already becoming a limit at 1080p.
4GB R7 370