Ranked in these QuestionsQuestion Ranking
Pro New C# IDE based on ReSharper and the IntelliJ platform
ReSharper is a popular Visual Studio Extension for .NET Developers. IntelliJ IDEA is a popular and fully featured JAVA IDE.
Pro Multiple runtime support
Project Rider supports the .NET Framework and Mono, with CoreCLR support in the works. It also includes templates for creating new projects, and when you create an empty project, it's literally empty
Pro Build, run and debug
Project Rider can build MSBuild and XBuild solutions as well as DNX/.NET CLI projects, and allows debugging .NET and Mono applications. DNX/.NET CLI debugging and CoreCLR support are coming.
Pro Cross Platform
As well as running and debugging multiple runtimes, Project Rider itself runs on multiple platforms. It runs on Windows, Mac OS X, and Linux.
Con Early Access Preview
Expect a few bugs! Full version yet to come. Pricing structure as yet unconfirmed.