Which is better for gaming??

2.

the A10 will pace the i3 in cpu tasks, but that gpu is terrible in comparison to the one you're sticking on the i3. the i3 with that gpu will slaughter the a10 with the 6670.

even in dual graphics the a10 will get killed.

I would perfer you go with an FX6300+7790 or 650ti BOOST. that would kill both combos.