I love that you can actually make user flows that show interactions between personas. The functionality is easy to use and doesn't overcomplicate things. I have used basically every mapping software out there (I was actually hired to review these tools for a UX team) and I always come back UXpressia as it does what I need from customer journeys right through to Service Blueprinting.

It has many resources such as personas, for example.

The easiness of creating journeys from scratch. It is very intuitive for creating the flows and steps. It works as a white canvas, so you can create tailored journeys To easily draw and create diagrams/journeys is the best