Got it - FreeSync at 48-144 with DP, 48-120 with HDMI. Since it has LFC (Low Framerate Compensation) you can actually get it to adapt down to 24fps if the need arises.
That all said, what are you going for, frame-rate wise? Are you looking to hit those max values of 144fps? Would you be happy with less, say, locking the framerate to a max of 100 or something?
In any case, I'd recommend the Navi cards, if you were to get something today. Here's the performance of the 5600 XT (the 5700 non-XT is also rated) at 1920x1080
https://www.tomshardware.com/reviews/amd-radeon-rx_5600_xt/2
When they fully reviewed the 5700 and 5700 XT, they didn't show 1920x1080 results, but started right at 2560x1440, here:
https://www.tomshardware.com/reviews/amd-radeon-rx_5700-rx_5700_xt,6216-2.html
You can take those numbers and multiply them by 1.7 to get an approximate idea of what the frame rates would be at 1920x1080.
Bang for buck, especially on a FreeSync monitor, I cannot recommend Nvidia. Go with one of the AMD Navi cards, they greatly outdo Nvidia on performance per dollar. Sometimes, the 5700 is only slightly more than the 5600 XT.