I don't have a mini but do have an ipad.
If you want to play with Android I say save a few dollars and try the Sero Pro.
I wouldn't sell me iPad mini for a Nexus, there's nothing wrong with a Nexus
Honestly I don't think you could go wrong with either unless you want to run a specific OS dependent app.
If you've used one tablet, you've used them all. I don't think one is any easier to use than the other.