What games are you looking to play?
4k may be overambitious for an RTX 2070 Super, depending on the title and the settings you aim at. Or you may prefer keeping framerates higher and opt for a 1440p or 1440p ultrawide monitor.
The Samsung looks great but be aware that 32:9 is a very niche aspect ratio. Although 21:9 support (ultrawide) is becoming more widespread, it's still not universal, and 32:9 (super ultrawide) support is not guaranteed even for titles that do play nice with 21:9. (the usual monitor aspect ratio is 16:9 which is still sometimes called widescreen)
And also, in more demanding titles the 5120x1440 resolution will likely test the RTX 2070 Super beyond its comfort zone.
For a 2070 Super, 1440p 144hz or 1440p ultrawide would be the most obvious choices.
There's a huge number of 1440p 144hz+ monitors. Choices to make include 27" or 32/31.5", and TN/VA/IPS panels. Many 1440p VA panels are curved (and if it's 1440p and curved it's almost always going to be VA). One of the most well thought of gaming monitors is the LG 27GL850, with its nano-IPS panel.
1440p Ultrawide is mostly 34/35" VA and at the higher price range IPS panels. Things like MSI Optix MAG341CQ at the value end, and things like the LG 34GK950F-B at the higher end of the scale (nano IPS,
The light might not be complete, but you can see Nvidia's gsync compatible list here:
Search for GeForce G-SYNC gaming monitors.
Also just because a Freesync monitor isn't validated as gsync compatible doesn't mean it's not going to work fine. Most of them do!