What am I looking at for the Average file size for Unity FREE vs Unity Pro iOS ?
I understand the Pro has some optimizations for this, but I’m beyond the trial to verify.
Hmm someone should first build with the FREE version and then the PRO so we can compare. Any PROs out there for the showdown 
It depends on your code and what stuff you’re using, so nobody can give a definitive answer, and the code size is likely to be outweighed significantly by the asset size anyway. Also the OTA limit is 100MB these days, if you care about that, so code size stripping is much less relevant.
–Eric
I am thinking…, no code, just empty project.
Although the OTA limit is that high, users are discouraged by file sizes when selecting what to download. So there’s some strategy in this. 
Unity Free is pretty small these days. I was surprised it is smaller than Corona SDK in many cases. iOS and Android are significant different sizes though.
A code only project on Android is less than 8Mb with Unity Free and no stripping.
Perfect. If it was really high I’d probably be discouraged from using Unity and for smaller projects, especially non-games, I would use Adobe AIR then. But, this solves that.