The Nixeus that's on the Tom's chart as "best" is a 24", has a better response time (1ms), has all the connection types the Samsung does, + DVI (the Samsung does not). The Nixeus can also go up to 144Hz, but at that refresh-rate, it negates the need for both Freesync and Gsync. But, according to AMD, when using display-port and the what the monitor supports, it'll do free/adaptive sync at the monitor's reported refresh rate; http://support.amd.com/en-us/search/faq/222. The Nixeus is $110 more than the Samsung; kinda steep!
The only advantages that I can see with the Samsung: lower price, better view angles/possibly better contrast/colors; some calibration/tweaking and patience can remedy most monitors that might not have great...