AMD current gen mobile platform:
x2 L625 (18W), 780G + SB710 (11.5W+4.5W)

AMD next gen mobile platform:
Ontario (9W), Hudson M1 / D1 (~6W)
Zacate (18W), Hudson M1 / D1 (~6W)

Intel Atom mobile platform:
Atom D51x - Pineview (13W), NM10 (2W)

Intel Core ULV platform:
i3-330UM - Clarsdale (18W), Ibex Peak (3.5W)

I don't think Atom is competitive at all.