ninjamock makes has very good Team collaboration capabilities, allowing multiple users to work on the project simultaneously. From prototyping to wireframing, it very nicely caters to my requirements as a designer

best thing about ninjamock is its intuitive interface and ease of use. Creating interactive mockups is a breeze with the drag-and-drop functionality and extensive library of pre-designed UI components.

I like the prototyping and interactivity aspect. It generally provides tools for creating interactive prototypes, allowing me to map out the flow and user interface. I enjoy that it supports linking between screens and creating clickable prototypes that provide a realistic experience for testing and feedback.