Defaults
These are my app defaults. They are the same on almost all devices and rarely differ.
Mail client: Apple Mail
Mail server: lima-city
Calendar client: Apple Calendar
Calendar server: iCloud
Photo management: iCloud Photos
Contacts: iCloud Contacts
Chats: Signal, iMessage, sometimes Element
Browser: Safari on iPhone and iPad, Firefox on Mac
Cloud storage: iCloud, Nextcloud and Proton Drive
Music: Apple Music
Maps: Apple Maps
Word processing: Pages, Goodnotes, Notion