Well, that depends on why they are anti-Apple. I mean, to raise a good argument, you have to know what you are stating your case against.
But in general, here's a few of the "pluses" you can build a list on:
1)More apps that any other platform, and they are compatible with other Apple mobile devices.
2)Suburb customer service/warranty policy.
3)many schools and businessses are moving to Apple mobile devices. Great to keep with the curve and not be left behind.
4)Tracking apps. This is in case you lose your phone, or if your parents want to check up on you ( if you want to let them.)
5) Educational apps. Learn More!
6)ease of use- So easy, you can let Grandma use it and she'll get by with very little instruction.
7) It's an iPhone.
8) One manufacturer, so consistency with design, build, quality
That's all I can think of in 2 minutes, but I am sure others will chime in with more.