I just wanted to chime in about Apple upon reading a few things here.
First off, the iPhone sells more than any other phone. I'd seriously hope so since it's a logical fallacy to argue it any other way. There can't be any other iPhone at the moment because that would disrupt Apple's marketing. They market the iPhone like it's something you'd sell your first born for. To offer a half a dozen different varieties of it would kill the luster of the iPhone relegating it to "normal" status.
Statistically and probability speaking, it is virtually impossible for any Android phone to sell more than the iPhone because the consumers have TOO MANY phones to CHOOSE from. Those are the key words with that argument. This also fits in with the iPad because it follows the same principle. You notice there isn't much argument about how the iPod sells more? That's because there are four varieties compared against a massive market of MP3 players that cost as little as $20. It only exists for the iPhone because of the status symbol Apple has marketed.
Finally, Apple's profits. I really hate Apple for their smug attitude, but they really have a genius tactic in play here. They take outdated technology that can be purchased cheaply, add their custom software that has been programmed specifically for the hardware (take note only ONE iPhone), and sell it at a 200% mark-up. I would think there was something illegal going on if they didn't make huge profits.
Before anyone mentions the whole multiple incarnations of iPhone, ask a 3GS owner how much they enjoy iOS 4.
Also, the comparisons aren't really valid. This is just a wishlist in my opinion. None of these tablets can reign supreme. Only the Xoom is actually out right now and it suffers from a high price tag, incomplete OS, lack of options compared to the iPad, and very limited apps. The LG tablet is gimmicky, the Samsung tablet is a just a blown up Galaxy Tab, and the iPad is an incremental step up (in keeping with Apple's play-it-safe-high-profit-margin tactics). Android tablets aren't going to take off until they stop getting packaged with data plan deals from carriers. Until that happens, the iPad will continue to beat all of them sadly.