CPU decision

i3. The APU's have better integrated graphics, but are way behind the i3 in everything else (especially those two).

More specifically
AMD VISION A6 APU
AMD Dual-Core A4-3305M (Vision A4 APU)

It doesn't matter. Even a A8 can't keep up with an i3 in pure computing power. The only reason to get an AMD APU is for the integrated graphics if you don't want to (or can't) use a discreet card.

As Dj said the only good thing about the APU's is they have very good integrated graphics much better than Intel. In terms of just CPU power the I3 is much faster and more efficient than any of the AMD APU's.