Well, the difference is that AMD has only plan for tablet PC APU, whereas intel has promised tablets and phones SoCs. Plus AMD has a history of supporting free drivers initiatives, while Intel has a history of developping open source drivers (actually, they promised at some point that their soon-to-come SoC graphic and wireless drivers would be open. Encouraging, but I won't keep my hopes too high on that either)...

So I'm waiting for the open-source drived Intel SoC mainly because it actually has a chance to happen in the next 6 to 12 months.