I prefer android over apple for the reason that its open-source, that means that the majority of the apps are free, and you get more revolutionary and cutting edge apps.
the android market already has 250000 apps- closing in on apple 500000, some say it will surpass it before the year is over.
security
both Iphone and android offer equal security, though they have different means of doing it.
iphone, verifies all the apps so you cant get a virus through an app, but the rest of the phone is semi-vulnerable.
android, does not check the apps,but the apps are run in a isolated way, as to not effect the system in event of a virus.
so both phones are equally prone to viruses (and if this a big deal for you, android has a antivirus app, which iphone does not)
other reasons for android
turn-by-turn GPS
better and larger screen
no need to connect to computer to sync
heres a big one, add a sd card
better calls
more customizable
more powerful hardware
flash support, watch ALL the online videos
Also apple never invents anything, all they do is steal old technology, give it a fresh coat of paint and mass advertise it as magical and innovating, thus fooling the mass of the population into believing that apple offers cutting edge technology, that in fact has been around for quite a few years.