Axure is the best tool for creating clickable prototypes. I've used so many other tools that fall short. Dynamic panels are great. It takes time to create the prototypes, which is counterintuitive of the purpose of prototyping, but when you have tough stakeholders with no eye for design... axshare is great and allows for publix testing of designs but may be a legal issue with your company.

The granularity and complexity of designing interactions

The interface has only gotten better with each version. It’s very straight forward and not cumbersome like other applications. It makes prototyping concepts very easy and efficient. The support within the community is very large so finding answers when necessary is very easy to find.