Reasons I prefer the Mini Retina over the Nexus 7:
(1) Form factor - 4:3 7.9" display is just better for a tablet. I also HATE the bezels on the N7.....
(2) Ecosystem/Apps - tablet optimized apps are what make the iPad the superior experience in my opinion. For what I use my iPad for (games, reading, videos, sports), the apps available on iOS are 99.9999% of the time as good or better than the equivalent Android app.
That's really all that's needed for me to "justify" the extra expense (which, for my 32GB wifi only model comes out to about $230). Having owned both I know that the mini has more "value" for me because I'd rather pay $499 for a device I'll use constantly than pay $269 for a device I'll never use.
But as some have already said - the choice is up to you. Get whatever you feel is right for your situation. There isn't a "one size fits all" for everyone. You have a return period. Buy one, try it out, return it and try the other one. Then decide which is best for you.
1. You mean in your opinion, 4:3 is better for a tablet? I love the form factor and ratio on my Nexus 7, and it never inhibits me nor causes problems with reading websites, or small text on the screen. It might be a little narrow in portrait, but it's nothing that makes me wish I had a mini.
2. Sure, Apple has more apps, and more apps that are catered to tablets, however I still find PLENTY of apps that I need (Facebook, Instagram, Snapchat, Netflix, Pandora, banking apps, etc) basically all the apps that I use, Android has just fine. Are iOS apps more plentiful? Sure. Do they have a better selection of games? Sure. That is because of the sheer fact that people more commonly have an Apple product, so more effort is being put into developing. Android has come a long way, and it's closing the gap and catching up.
Listen, we can all argue until we are blue in the face about what device is better. But it simply is different for each individual.
Of course people like me who bought the Nexus 7 are going to defend it, but it's a little annoying to see people who bought the mini coming in and saying "oh yea, the mini is way better, even though it's double the price."
This all just shows HOW good the Nexus 7 is, it's constantly being compared to tablets that are DOUBLE it's price.
In my opinion, for the price, for the specs, the raw power and performance, the Nexus 7, for that price, kills anything.
I mean, think about it... Nexus 7, $230, iPad mini $400. Go ahead and get the more expensive device, but at the end of the day, a tablet is a tablet. Most people use tablets for heavy web browsing, watching media, etc... and the Nexus 7 does it perfectly for.... half the price. Some people think more about what your paying and what you're getting, not paying double the price and getting sort of a better experience.