android

PROS:
- Huge VARIETY of devices
- Different manufacturers and software
- The newer phones have BIGGER and BETTER screen displays than iPhones
- The newer phones are much MORE POWERFUL
- Android's are known to be very laggy, but with the new Jelly Bean 4.1 version of Android, they adjusted the frame rate similar to iPhones. Now it's even smoother than the iPhone.
- MUCH MORE CUSTOMIZATION! Widgets, Live Wallpapers, Launchers (Home screen replacements) etc.
- Newer phones have awesome cameras
- Better way to get free music, etc.
- Again, powerful and very customizable.
- Open source OS
- Google Play Store.... apps, games, books, magazines, movies, tv shows
- Your phone is what you make it

CONS: 
- If you don't get a Nexus phone (like the Galaxy Nexus by Samsung) it will take a long time to get system updates
- some lag (will be fixed with the new 4.1 jelly bean software)
- Battery life on SOME phones
- Bad build quality on some deives..(e.g. plastic)

iPhone:

PROS:
- Good build quality
- Simple interface
- user friendly
- better apps
-retina display

CONS: 
- way too small
- not customizable at all
- no flashable roms like android
- some features copy Android, and vice versa
- overrated
- costs too much
- has the apple logo, which supposedly makes it better?
- only customizability is the wallpaper, and folders...lol....