It's the big question, isn't it? Sprint vs. AT&T, Palm vs. Apple, physical keys vs. solo touchscreen. Here are recent stories to help inform you about every aspect of both, so your eventual decision is intelligent, whichever one you choose.
Stay tuned for more issues and revelations with the 3GS when the phone finally ships to customers, and people start the inevitable complaining.
What about the original $US99 iPhone 3G? And while we're at it, what about the best BlackBerry and Android phones? Hey, that's why we wrote up the Smartphone Buyer's Guide: The Best of the Best. You can thank us later. Or now, below, in comments.