Apple is the king of interface and integration. Their stuff just works, it works together, and it works well. Their interfaces are beautiful and simple to use. Their innovation when it comes to use-cases is outstanding.
However, Google is....for lack of a better description.....f-ing crazy. They are a bunch of geniuses who do stuff just to prove that they can. They're taking over the world and they'd have a Google satellite spying on everything Apple does in a heartbeat if they so desired. Google's interfaces to their apps are not pretty, but they do crazy stuff that you never thought possible. It's only a matter of time before Google figures out that most consumers only care how pretty a product is. Android 3.0 and 4.0 and beyond are gonna be able to do some crazy crap and will look beautiful and will seriously give the iPhone OS a run for it's money. It'll be faster, more efficient, and run on all sorts of different hardware for way cheap.
I personally hope neither Google nor Apple wins, as that breeds amazing competition. But as I see it Apple is an amazing CE (consumer electronics) company, but Google is seriously in their own league when it comes to seeing into the future and shaping the future of not only consumer electronics, but technology and data as we know it. Google seriously kind of scares me.
For example, this whole Google navigation thing. It may single handedly put Garmin out of the mainstream GPS navigation market. It's always accurate, integrates with Google maps, and is totally free. Google does crazy crap all the time, and it's free!!!
Comparing Apple to Google is like comparing Mercedes to NASA.