Why iPad Air 2 is better ?

Hi, this message is for apple. Why iPad Air 2 is better than iPad mini 3

i love iPad mini 3 more than another iPad because it's mini comfortable for eyes, very portable..

SOme people answer me because there aren't more space like iPad Air 2 to be better than it.

but why iPhone 6 Plus better than iPad mini 3 and it is small .

please apple the next generation, I want the mini be better than another new iPad generation

thanks