iPhones provide better privacy and security than /e/OS including for their services which largely support end-to-end encryption with the Advanced Data Protection feature for iCloud.
/e/OS has far worse privacy from apps than iOS. With /e/OS, you cannot give apps access only to certain contacts or certain media/storage if they insist on demanding access to all of it. There are a bunch of other unaddressed privacy weaknesses, especially due to the older Android version.