Samsung are not the leaders in tablets. Their Galaxy SII is excellent, and easily a rival to the iphone 4S, but has the additional freedom. The (software) difference between Samsung Galaxy SII & a standard Android phone is solely the Touchwiz 4 interface ... which any self-respecting nerd has replaced with something better anyway.
If you are suggesting that Google is NOT innovative, and is solely copying the iOS, I think you need to look at the recent iOS update log features, the majority of which Android has included for years, whether as standard or via CFW, but iOS has just implemented as features a few weeks ago.
At any rate ... linky. I don't think anyone can really argue with Forbes, although I'll admit, I have no idea how Forbes calculates those figures .. possibly solely on their annual reports/cash.
While Apple is rated highly, Google isn't far behind, but Google has a massive product portfolio to maintain/expand, while Apple has a very small dedicated product portfolio.
Don't put all your Apples in the one basket ...