Let's say you want to be using AT&T's network. You want to be using a high-end smartphone. Currently the best two choices are the Samsung Captivate (AT&T's Galaxy S offering), and the iPhone 4. If you are already an Android freak, then this is easy. If, however, you have not yet decided, then how do you choose?
Allyson at TiPb did a side-by-side comparison of the two. Hardware, software, pros, and cons. She really did a good job of approaching the comparison without prejudice. You can check out her coverage here.