>..do magnetic platters offer longer lasting data integrity than SSDs in cold storage?
Yes. With an SSD the enemy is electron leakage. Minute quantities of electrons trying to escape an unnatural state and return to equilibrium. (yes, I just anthropomorphized electrons.) Magnets however are more stable by nature. (yes there is nothing natural about hard-drive storage. SMR doubly so!)
Anecdote/anecdata: I have been able to retrieve full drives worth of data off of drives that have sat in a cardboard box for 10 years. I also have trouble accessing data on 1-year old USB flash drives.
Yes. With an SSD the enemy is electron leakage. Minute quantities of electrons trying to escape an unnatural state and return to equilibrium. (yes, I just anthropomorphized electrons.) Magnets however are more stable by nature. (yes there is nothing natural about hard-drive storage. SMR doubly so!)
Anecdote/anecdata: I have been able to retrieve full drives worth of data off of drives that have sat in a cardboard box for 10 years. I also have trouble accessing data on 1-year old USB flash drives.