The difference is that Google Plus looks absolutely terrible. I'm not kidding - load it up now - and look at the incredible amount of clutter around the content. The new Facebook News Feed is about highlighting content (and no doubt, ads), the G+ homepage is full of junk.

Don't get me wrong, I can see where there could be some inspiration taken, but the News Feed looks like G+ done right.

The G+ app, on the other hand, is great. No complaints there.