iPad Air 2 and rumored iPad Pro comes in three storage sizes: 32GB, 64GB, and 128GB, iPad Mini 3 in two sizes: 16GB and 32GB. The more gigabytes in Cellular data plans you have, the more content you can download on your iPads — apps, HD videos, movies, photos, books, magazines, and more. iTunes Radio !!! If, for example, you like having a large music library or you frequently download HD movies, it’s a best idea to consider an iPad with a larger data plans. Always be connected.