iPhone Flash CS5 or Corona

I’m thinking about iPhone/pad game development and wondering what’s best to use, Flash or Corona.

I’ve read on here and elsewhere about the poor performance of Flash converted apps on the iPhone so if I was to do an arcade game or a physics game Corona is the obvious way to go, but what about games that don’t require lots of moving objects on the screen.

Specifically what I want to know is, what are the advantages then to using Flash CS5 to create iPhone apps? is there something you can do when using Flash that you couldn’t or would be harder to re-recreate with Corona?

thanks for any advice.