I have not researched this question...and actually would be surprised if there is any scientific research comparing the neck-hanger and floor stand options...but I have a purely intuitive rule. I never pick up or hold a guitar by the neck.
Wood swells & shrinks maybe daily as it ages. And especially for older guitars, the screw holes begin to erode with each dis-assembly. I see vulnerability at the neck joint, even for set necks, and just would not hang my guitars. I have one guitar stand and the guitar I'm playing at the moment may stay there for a day or two.
Bottom line, leaving guitars out of the case for any length of time gradually compromises the integrity of the wood and also each spot where two pieces of wood are joined.
I know this sounds a bit rigid & preachy.... 🙄 ...whatever you choose, enjoy the music!
Doug