Are you referring to the GTX 970 vs R9 290X? The 970 is cooler and quieter, with a slight performance edge*. And yes, GPU Boss is extremely biased towards Nvidia.
New, the 290X has the best cost/performance, but as you are willing to consider open box/refurbished, that $263 GTX 970 is a better deal than the $259 R9 290X
*970 performance edge is at 1920x1080. At higher resolutions the R9 290X takes back the performance crown.