Start with Google if you want the quickest setup.
Google creates the authenticated baseline and the matching profile document in one step. Email/password stays available when you want a dedicated login.
Registration should feel like setting personal tone, not filling a generic account form.
Identity posture
Registration should feel like setting tone, not filling boxes.
Establish a baseline for language and public-name or anonymous posture.
Registration note
Auth plus profile, not auth alone.
This route now creates the Firebase auth user and the matching profile document so She and protected flows have a real starting point.