Q: I plan to buy an iPad , air or mini? What is better.

Technically both are the same. One is bigger, one is smaller (also the price, but not much). I just picked the Air yesterday evening.

iPad Air vs. Retina iPad Mini: Which tablet is right for you?

http://reviews.cnet.com/8301-31747_7-57610252-243/ipad-air-vs-retina-ipad-mini-w hich-tablet-is-right-for-you/

16GB vs 32GB vs 64GB: Which new iPad storage capacity should you get?

http://www.imore.com/2012/03/08/16gb-32gb-64gb-ipad-capacity/http://www.imore.com/2012/03/08/16gb-32gb-64gb-ipad-capacity/

How much content will fit on my iPod or iPhone?

http://support.apple.com/kb/HT1867

How Much iPad Memory Do You Need?

http://ipad.about.com/od/iPad-Tutorials/a/How-Much-iPad-Memory-Do-You-Need.htm

 Cheers, Tom