The whole integration issue is moot. Some of this thread reads like individuals who have not used both platforms on a daily basis, or I suspect that'd be saying how easy it is to integrate your laptop, contacts, calendar, email, tablets, etc. on both platforms. I use both interchangeably myself and have found both to be comparable on this front. Although, I think Google's Calendar and Email beat anything Apple has offered up to this point. The big difference is that Apple tries to force a one size fits all approach, while Google clearly does not. Some love that, others don't.
The whole infrastructure issue is moot, as well. Both are robust. Google rolls their own, while Apple's iCloud uses Amazon Web Services and, believe or not, Windows Azure until the Maiden DC is completely ready to take over.