I've done pretty extensive research between RIM and Apple, and I'm an Apple fanboy, and Apple has a ways to go to catch up. There is no full device encryption for iOS, just Apple Data Protection, and very very few programs take advantage of that. You cannot restrict built in apps, like Notes from syncing to say, Google. The granularity of controls on iOS just isn't nearly as robust as with RIM?

That as said, what phone do I use? iPhone. But I don't use an iPad for work as there is no way for me to edit a document and keep the document encrypted. Also, Apple's iOS isn't FIPS 140 validated (although that is in the works). Once it's validated, there are still precious few programs that take advantage of the encryption. Having to rely on end users to know what's encrypted and what isn't is NOT a good security model. Even worse, there no way to tell what's encrypted and how; you have to just know.