Its really not a fair comparison, their architectures are grossly different so very few applications could run on both of them. The Atom is x86 based while the Cortex-A7 is an ARM chip that also integrates a variety of antennas.
It seems to me like you are comparing a tablet with an atom to a tablet with an ARM chip. In reality you should be comparing the tablets not their processors as a tablet that is tiring to hold for long periods of time is worse than a weaker tablet that you don't mind holding for a long time.