Carii
The thing I like most about Carii is that it blends the best of most other platforms into one platform. From the unique feature of it not just being a community platform, but an ecosystem of communities, to the analytics, the branded community platorm give you features that allow chat, video, events, adverting, and externally sharing content to social channels that helps drive new member signups. Different member levels can allow for free and paid members as well as different admin permissions. Although we haven't implemented it yet, the platform can incorporate ecommerce to increase revenue opportunities from your community.
To sum up, the variety or features in this one platform takes the place of several different platfroms that often don't integrate with each other. The ecosystem of communities is unique to this platform. It creates a way to monetize the community efforts in additon to supporting organizational goals.