What's the difference between PROS and RobotC

Currently I use RobotC and I think you need RobotC for competitions. What’s are the benefit for using PROS?

First, I’ll say that PROS is legal and useable for competitions. One thing that our programmer @stephn likes is that PROS allows you to use the Atom text editor, which is really nice.

PROS lets you use virtually any text editor/IDE you want. All compiling and uploading is done through the command line, so even if your editor of choice doesn’t integrate with external tools it’s not a big deal.

Probably the biggest benefit is that you can use real C or C++ rather than the RobotC variant of C.