Not a lot of info out on the AMD E-450 APU equipped 1225 or U32U yet.
But the E-450 1.65Ghz / HD 6320 APU is about right for the work you mentioned.
A bit weaker than you might expect for gaming though. AMD Radeon HD 6320 review
I don't see the RAM difference being significant.
Performance will be virtual identical. Portability factor (size/weight) is close.
If you can figure out which one has the better battery life that might be the one to go with.