My understanding of these system is that
Free sync is built on the adaptive sync standard and I have never seen a monitor listed as "adaptive sync" only "free sync", I'm hoping Simone jumps in here if they have seen otherwise.
I guess my other question would be are you talking about the Nvidia "Adaptive V-sync" vs. "G sync"?
Regardless, of you are going to be running a 1080ti I'm pretty sure you are going to be stuck with a G sync monitor as the last time I looked Nvidia cards will not enable Adaptive Synchronization on a non G sync monitor.
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Also I looked up both monitors you have listed and they support Free sync so will not allow for variable refresh rate with your 1080ti.