Choose the booking model.

A bookable appointment needs every required person, place and item at the same time. An empty calendar alone is not capacity.

Specify the appointment, its required resources and the conflict that must be prevented before comparing feature lists.

Trafft merits a shortlist when appointment availability depends on shared resources; a simple solo calendar may not justify its resource-capable plan.

Choose by the required feature and current limits, not by a headline price or a feature name shown without an inclusion mark.

Compare how each system consumes a resource; both document resource handling, so the winner depends on the appointment model rather than a generic feature score.

Choose the operating model first: a hosted appointment service and a WordPress booking plugin create different maintenance obligations.

If Square is already central to your operation, test its documented resource controls before adding a separate scheduler.

Compare a resource-aware scheduler, a room-first calendar and your existing setup against the same constraint before buying another tool.

Keep a working system when it already prevents the relevant collisions and a replacement has no demonstrated operational advantage.