I was never partial to the boing ball. It just looks like something out of a children's book.
I really like the double checkmark logo. That was the embelem proudly printed on the front of my A1000, and I still love it.
In my opinion: Redesigned boing ball for the Amiga trademark, double checkmark for the OS, and the OS should be renamed to Workbench. "AmigaOS" just sounds so... cluttered.