Apple iCloud privacy policy mirrors Google's. You gain absolutely nothing if you upload your contacts, photos and other data to iCloud. Apple also regularly gives iCloud data dumps to US government (they approved and delivered data in about 80% of US Government requests in 2017: https://www.macrumors.com/2018/05/25/apple-second-2017-trans... )
(The exceptions here are iMessage and phone backups which are E2E encrypted.)