@drskrzy I moved your post over to this existing thread: Billed by Apple - Switch to annual subscription
No - canceling your subscription through Apple, and resubscribing directly through Pandora will not result in the loss of any of your collected content (stations/playlists/etc).
For instructions on how you can switch to the annual subscription to Pandora Premium, check out the accepted solution to this thread.
Hope this helps!
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