When the IPad Mini was released, the first review I read was negative, but it seems like many prefer the Mini to the fullsize. I think it really depends on your needs. I already have a 10″ Android tablet that gets used around the house primarily for Youtube and Netflix and games. No need for another tablet here. But if I commuted daily on the train, I could see it being useful to have an LTE IPad Mini or Nexus 7.
Preference: Apple IPad Mini
Preference: Apple IPad “3″ (and current “4″ w/ faster A6X Graphics)
Background on the Apple IPad Mini
Overall? IPad Mini or Android 7″ tablet (Google Nexus 7, Amazon Fire HD). I think this really comes down to whether you know there are Apple/iOS only apps or games you want/need. If not, you might be happier with Android because of price and screen resolution.
Games? Apps? IPad Mini
Eyesight/reading? IPad 4 or 7″ Android tablets (all are “Retina”)
Second iPad: IPad Mini
Wait for Retina IPad Mini? This will take quite a while. Don’t wait.