Reading through this thread it's interesting because I can almost tell what Amiga you own and when you joined the community or if you are running an EMULATED Amiga through WinUAE (which uses Picasso).
Either way I think both are great standards. As an Amiga Forever user (not the latest) aka WinUAE, it was the first time I had used an Amiga in a higher resolution mode than the Amiga directly supported. It made me think wow I had missed something. The speed was good the support was good. The thing I missed right away was draggable screens.
Even though this is a feature that is specific to the OCS/ECS and partially implemented in AGA (dependent on screen frequency). I really miss draggable screens. It's a User Interface element that other operating systems lack. I found it one feature that intuition had over MacOS, Windows of the day.
I think being able to organize on screens as well as virtual screens is a key element of the Amiga display that shows off it's power. Too bad it didn't translate to vga and advanced displays as easily..