Are you on a Freesync monitor, then?
Unless the Radeon VII craters in price by next year it appears to be the clearly inferior buy, new. Lowest price I'm seeing on PCPP atm is $730. Meanwhile, the RTX 2080 starts at $700, and there are far more sales on it (the best I saw was $590).
https://gpu.userbenchmark.com/Compare/Nvidia-RTX-2080-vs-AMD-Radeon-VII/4026vs4035
NVIDIA still has better driver support across games, as well as more gimmicky bells and whistles like Hairworks, and with +1300% market share for this matchup expect developers to care more about catering to the RTX. Then there's the matter of ray-tracing. It's also runs much louder, and a bit hotter.
If not Freesync, are you favoring the 37% advantage in FLOP power and the 16GB VRAM?