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My wife has an Android based Samsung Moment and it is an awesome phone. It is just like the Motorola Droid but on the Sprint network.
I have the iPhone... and from playing with all the various phones I still think the iPhone is the best. The android phones are coming in at a close second, but their UI isn't quite as easy to use or as fast. The iPhone is a little older and more refined... not to mention it is also the best music player in the world. iPhone works with my car, my portable stereo, and my alarm clock... the iPhone is just the universal device...
But the Palm WebOS and Android phones are good phones. Blackberries are horrible in comparison... IMHO.
Also look at the Droid Eris on the Verizon network... or you can wait for the new Google Nexus One phone all the buzz is about.