Back in the day, the hardware module was a huge advantage not just from a range pov (agree you don't really want to be dropping below 50 fps at most regardless of free/g sync anyway) but most importantly, having variable pixel overdrive/response i.e. essentially motion clarity for when your fps is fluctuating. TFTcentral (arguably one of the best monitor reviewers) did a good article explaining the pros and cons:
A detailed look at variable refresh rates (VRR) including NVIDIA G-sync, AMD FreeSync and all the various versions and certifications that exist
tftcentral.co.uk
There is a lot more to it than just the range differences.
I would argue that for LCD screens, the gsync module holds more pros and less for oled since oleds pixel response is instantaneous, however, PCM2 has stated even here, the gsync module has it's advantages:
Hi there, I currently use the LG 34GP83A which for me replaced the older LG FreeSync UltraWide you reviewed. I really like the 21:9 aspect ratio and I'm happy with the pixel pitch. But your review of the Alienware has me really salivating at the thought of a QD-OLED version. That contrast. Those...
forum.pcmonitors.info