It really comes down to if your friend wants to have an
iPod attached to his phone or not. If that's necessary, you can't beat the iPhone. If your friend doesn't care about the phone being an iPod, it really depends on what design he prefers because the functionality is highly similar. Both phones can talk well and both phones text well. I would go with the cheapest one you can get your hands on if talking and texting is the most important.