Id say that is very true if that is your conclusion. There is no possible way if you rooted it and used custom ROMs and all that stuff you can say a jailbroken iPhone is way more customizable.
Hec, unrooted an Android is more customizable imo. I see many people who say the SBSettings function is the most important thing in jailbreaking.... thats standard stuff on Android.
There is so much more you can do on Android. Different keyboards, launchers and the way you want it to work, so many ways to customize your SMS....the list is endless.
I concur