What is the best (most productive) FLEX IDE?

Question

Some requirements:

• Step-by-step debugging & Break Points
• View variable values while debugging
• IntelliSense (auto-completion). Ideally don

Answer 1

I've used them all and I can say without a doubt IntelliJ is the most powerful of them all. http://www.jetbrains.com/idea/features/flex_ide.html

It also is the best JS IDE, and unless you are using .NET on the back end it is probably the best IDE for your back end language. These guys really have it going on.