I'm not sure what you are getting at. My point is that they are very different companies, with different ways of making money and different risk profiles. But

I'm not sure what you are getting at. My point is that they are very different companies, with different ways of making money and different risk profiles. But all with massive growth currently. So to your question about which one to invest into, then you would make that decision based on which vertical you prefer (ads? service? consumer hardware?) or which one is more risk tolerant. Or since they don't overlap that much (when just looking at tech), you could invest in all threes. Unlike say, FB and GOOG, which are both suffering from the same risks (but are making different bets for the long term).