SMS vs Email for Event Invitations
Text messages are read sooner and replied to faster than email invitations, and they are far less likely to be filtered out of sight before a guest ever sees them.
When SMS wins
Use SMS when you need a reply before a vendor deadline, when guests are mobile-first, and when an unanswered invitation costs you an accurate headcount.
When email still helps
Email carries long-form detail well: travel guides, schedules, and anything a guest will want to re-read later.
See also the event message templates.