When comparing FlashDevelop vs JetBrains Rider, the Slant community recommends JetBrains Rider for most people. In the question“What are the best programming text editors?” JetBrains Rider is ranked 34th while FlashDevelop is ranked 41st. The most important reason people chose JetBrains Rider is:
ReSharper is a popular Visual Studio Extension for .NET Developers. IntelliJ IDEA is a popular and fully featured JAVA IDE.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free
FlashDevelop comes without any cost.
Pro Haxe development support
FlashDevelop has first-class support for Haxe development, the open source toolkit based on a modern programming language and cross-platform library.
Pro Good code completion
FlashDevelop's code completion is pretty good.
Pro Excellent support for Actionscript 2 and 3 (Flash)
Although everyone claims Flash is dead, it's still quite useful for game developers due to its rapid compile and run times, as well as its great debugging functionality with FlashDevelop.
Pro Good number of project templates
While it's project template system is not the best compared to it's competitors, it still is decent and is a good way to generate some boilerplate code.
Pro XML/HTML completion
FlashDevelop has XML/HTML completion aside from code completion.
Pro .NET Framework 2.0 application
It's windows only, but has tremendous support from plugin developers and a dedicated team that's been developing it for close to 10 years.
Pro Source-control support (svn, git, mercurial)
Pro Great debugging
FlashDevelop provides very efficient debugging features.
Pro Supports Zen-coding for HTML
This is very useful for carrying out high-speed HTML coding and editing.
Pro Snippets
Pro Tasks/todo
Pro SWF/SWC exploration
Pro Great project compilation
FlashDevelop facilitates project compilation.
Pro Decent code generation
Although the code generation can't really be called top-notch, it's decent and sufficient for most developers.
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 Superior "quality of life" features
Extremely good at filling in all the mindless boilerplate type code while you stay productive.
Pro Fast performant
Rider has everything you want from a serious IDE, but without the bloat. This results in significantly fast performance in day to day operations.
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 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.
Pro Decompile code for any .net library
Pro Version control integration
Intellij plugins for Git, Mercurial, and TFS plus Local History of files.
Pro Supports all the development lifecycle
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 Excellent UI, Features beyond Visual Studio (File Layout just one example)
Pro Free for Students
With a university email, Rider can be obtained for free.
Cons
Con Windows only
FlashDevelop is for Windows only, and it's not cross-platform either.
Con Haxe debugging is in its infancy
Although FlashDevelop supports breakpoint debugging on Flashplayers, native Haxe applications (C++) can't be easily debugged within FlashDevelop.
Con Not free
Project Rider has a trial version available, but is not free.
Con No support for dotTrace, dotMemory yet on macOS
Support is promised on macOS, but currently only available on Windows. This means it’s not ideally suited for performance tracing and debugging.
Con Is RAM hungry
This product can hang a huge amount of RAM memory, up to 4 GB.
Con Relatively young project
Some bugs are to be expected since it's still a relatively young project.
Con Abnormal key maps
Though Visual Studio Key Map can be installed, it is still hard to find where the plugins are installed when one uses it to open a solution for the first time.