Care to elaborate? My iPhone basically has the same syncing functionality to our Exchange Server that my Blackberry did.
Sure. First of all, when I was using the iPhone 6 months ago, only 1 Exchange Sync was possible with the iPhoneOS 3.X. That was a big limitation for me since I connect to 4 business mailboxes and 1 personal one from my phone. And while iOS4 resolves that issue, it still is pretty bad using the ActiveSync/Exchange protocol for non-Exchange mailboxes such as Gmail. Specifically it fails to download and constantly gets out of sync. I had to switch to IMAP which is more reliable.
When it comes to the actual mail tool, my two primary business mail accounts are Google Apps so the searching, grouping, and labeling of emails is far better and looks way nicer in the Android app. And it's really easy to color code, manage, and switch between different mailboxes, calendars, and contacts from the various Exchange and Google mailboxes. And of course the grouping into a mail thread is great on Android - I personally don't like how it does it on iPhone (i.e. sent messages are not included in the group).
Finally, the notification options are so limited on the iPhone. You must notice that as a big difference from your BB. With Android I can customize it all I want.
So for my business needs, Android is easier to use and more flexible.
iPhone is still a great device. If you're big into multimedia (iPod functions), games, needing some specific applications that aren't on other platforms, or aren't a very technical person then it's a great choice.
But for business purposes or if you're a big personal or business user of Google services (particularly if you're a Google Apps customer), or if you're more technically inclined and like to customize/tweak these things a lot, then Android probably makes more sense.