None of your friends' suggested benefits of an Android tablet (open, mini-USB etc.) will help you in any of your stated usage and goals, for instance, you'll find better photo editing applications on the iPad all day long.
Do your friends use PCs? Have they ever owned an iPad? Did they own an iPad and then make the switch to Android? Is the answer "no" to these questions???
I personally have no idea why a Mac user would choose anything other then iOS for their tablet, For starters, the integration with iCloud for automatically syncing passwords, bookmarks, documents, and yes, photos, etc. seem to make it a no-brainer.
You
can use a stylus on an iPad, and there are several choices that use Bluetooth 4.0 that offer pressure sensitivity, etc. There are paint programs that output 4k images, and the A7 has the horsepower needed to crunch those kind of numbers with ease.
If you're concerned about the price don't worry, in two years when you sell to upgrade it will easily fetch $200 above an "equivalent" Android tab. Over the term of ownership, the cost difference amounts to pennies a day!
No offense, but your friends are either justifying their own purchases, simply not listening to your stated needs, or don't know what the hell they're talking about. For your uses and goals, get the iPad Air, you won't regret it.
