Retina iPad Mini vs Nexus 7

This is a pretty standard "which one should I buy?" post. Coming up to Christmas time, my very generous parents have agreed to match whatever I post money wise for a tablet. So if I pay $200, they'll match that and I'll be able to get an iPad Mini for Christmas. But looking at the Nexus 7 and various other tablets at nearly half the price, I'm not so sure that I'll be making the right choice if I go that route. I've already purchased a 32gb Nexus 7 for my girlfriend for Christmas, and after looking at reviews and such for both, it seems as if the Nexus 7 is an extremely viable option. With that background out of the way, here's what I'm looking at:

I'm already very invested in the Apple ecosystem. I'm typing this on a 2010 MacBook Pro that I love, and I own an iPhone 5 that is sitting next to me. I have many apps on both that I would love to have continuity between including Evernote, iMessage, my various games, Fantastical and iTunes. I don't actually own that much Apple specific content from iTunes, but a decent amount. I also own an Apple TV, but haven't had much of a chance to try to stream my own content from it. I'm not certain how compatible a Nexus 7 is with a Macbook either, or what the app store is like. I'm applying for medical school this following year and am enrolled in a few classes at my university, and I've been looking at the apps for the iPad and a few seem very useful in regards to anatomy and physiology studies. However, I'm not sure if the Google Play store has the same kind of apps or the same number of apps. I'm also worried about longevity. The first generation Nexus 7 was notorious for slowing down during its first year to become almost unusable, while my parent's first generation iPad was still doing pretty well after all these years. With medical school on the horizon, I don't want to have to purchase another tablet next year just to keep up.

tl;dr Is the App Store and Apple connectivity worth a $170 more investment for the iPad Mini, or is the content offered for the Nexus 7 good enough to get me through four years of medical school?

Thank you all in advance for your time!