btw everyone talks about work-flow this, work-flow that, the work-flow is a piece of cake if you know how to do it
It's easier to drag&drop some image onto a script in Unity or simply load it into your assets folder than define multiple (hardcoded!) BMAP*s in your scripts.
Also the possibility to write your c# scripts in Visual Studio (with runtime debugging) and have access to most of the .NET functions is a nive to have.
In my opinion Unity speeds things up a lot!