They absolutely mog the cancerous garbage that is NAND flash memory in terms of data retention. The fact that you can pick an 1980s floppy from the junk room and read it is telling. Meanwhile your average TLC SSD will probably get wiped in 3 years if kept in the drawer, and a QLC will get wiped in 1 year.
Reliability wise floppies are also better: flash memory leaks electrons naturally and gets shredded by radiation events, with temperaure accelerating these processes. Meanwhile magnetic disks are not altered by any normal magnetic field you could produce at home.
If you compare the thumb stick that came free from a convention then compare it to a floppy that came free with a magazine. And in the end neither matters because they’re both cheapest possible junk, not fair examples of the tech.
Similarly, the cheapest led bulbs (put in poorly ventilated fittings) have crappy lifetimes, but that’s not the techs fault, it’s because they weren’t engineered to last, they are cheap crap. Well designed leds placed sensibly are vastly better than bulbs, but that’s hidden by the cheap end of the market
More info here: https://www.urbandictionary.com/define.php?term=mog
Say, the Siemens PLCs I earn my living programming uses SD cards which range from 64kB to, uh, 128MB, methinks.
They still work after decades, so clearly, you can get long term reliable flash storage; just don't expect to be able to store your 4k holiday videos on them.
NOTAMs, on the other hand? Go ahead!