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.