My favorite part about Axure RP is the ability to share prototypes through AxShare. This has been extremely beneficial for me and my team when sharing prototypes with clients.

Different widget libraries available to use Able to set variable and global variables Good display and share with others

It is really powerful and you can really achieve a lot. You can do quick wireframes as well as complex high fidelity prototypes. It is very well documented and has a huge community. It is also an advantage that it is available for both Mac and Windows platforms. The learning curve is low in the beginning. One huge benefit are team projects.