iPhone 4. Nexus S. There's probably more to say about the differences than the similarities. Different operating systems? Check. Don't work with 3G on the same networks? Check. Different screen sizes? Check. Different philosophy and methodology towards multitasking? Check. Different video conferencing solutions (insofar as few to none work yet on the Nexus S)? Check.
The list goes on, but we're sort of guessing that for most the choice between the Nexus S and the iPhone 4 will be determined by carrier choice and OS preference more than whether Android's latest can go head-to-head with Steve Jobs' glass-encased wonderphone.
All that shouldn't stop you from hitting us after the break for a photo fight between the iPhone 4 and the Nexus S - with some extra attention paid to how the iPhone still has the best music player around while Android's just-released Google Maps 5.0 makes iOS's version look a little lacking.
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