Question Dual cortex a9 vs quad a7?

Hello people,

as the profile says, i'm newbie here, i want to know which is better the quad a7 or the dual a9, because i'm planning on buying a phone and those are the only [Available] phones in my country with medium budget 'ACE 3, Desire 310 [1gb ram], samsung s dous 2 s7582'

so actually, focus on the s dous 2 and the desire 310 because both of them are with the same price.

thank you.