The honest version of "does it integrate with my software." These are the systems this industry actually runs on, and what each one means for a build.
Planning CenterChurch management
Widely used across services, people, giving, registrations and volunteer scheduling, with genuinely good integration options.
Church Community Builder / Breeze / Rock RMSChurch management
The main alternatives, varying in how much they emphasize care, groups or giving, with Rock notable for being open and highly customizable.
Giving platformsGenerosity
Online, text and recurring giving, where a failed recurring gift is a quiet loss nobody follows up.
Volunteer schedulingMinistry teams
Rotations, confirmations and last-minute substitutions across many teams every single week.
Check-in and attendanceSafety and care
Children's check-in with security requirements, plus attendance patterns that are the earliest signal that a family is drifting.
CommunicationCongregation
Email, text and app messaging, usually broadcast to everyone rather than relevant to anyone.
Background checksSafeguarding
Screening and training for anyone working with children or vulnerable adults, on renewal cycles that must not lapse.