Are you sure it has an A8-5550m? This is a mobile/laptop CPU but there is also an A8-5500 which is a desktop CPU.
If it uses the A8-5550m -- Take the i3. No doubt about it. Performance is better than the A8-5550m in almost every area, including graphics.
If it uses the A8-5500 -- I would still take the i3. They are both quite similar in performance and the $130 saving on the i3 too much to choose anything else.