The best (at least for me) would be the combination of both. The body proportion of Caucasian women and Caucasian women's head shape (skull) with a bit of Asian features sprinkled in, like shallower eye socket, Asian almond shaped eyes, sharp chin and nose but not so defined (no cleft chin and the like please). A girl with a face like that would be pretty and cute-ish at the same time. Many South Korean actresses would make a good example....
that is, that White girls = hot, Asian girls = cute.
That's also basically the idea of female beauty for your average Asian.