The iPad mini is Not a Nexus 7
And it doesn’t need to be, either.
I really wish I wasn’t constantly asked to compare the two (which I will do), since each seems to be serving a different type of user. Is one better than the other? Yes.
But not outright.
One is a device that works “well enough” for $200, and the other is a device that works “well enough” at a different level for $329.
Comparing hardware-to-hardware or software-to-software specifications is disingenuous, at best.
One thing to keep in mind with either tablet: we’re no longer living in a world where individual devices are one-offs. A single product is designed to interoperate with others, coupled with a series of supported services.
Which, then, works better within the construct of the other choices you’ve made?

