well in theory, the dualcore would be faster in any apps that require only 2 cores,
but if the application takes advantage of 4 cores than the a6-3400 would be faster in that case,
in real world settings most programs and games just barely utilize 2 cores at best, and starting to be optimized for more,
so yeah the 4400 would be faster than that a6-3400 in 99% of cases.