I feel that windows phone is more realistic in its assumptions of how tiny and dense content can be and remain usable, but that's probably because i don't have perfect vision. I also think the chromeless look is more future-oriented, because it won't look dated as quickly. The iOS look already seems dated to me (perhaps because i used a mac for years before i saw iOS).

Oh, and the app-centric model of iOS and Android is in my opinion a design flaw. A humane design shouldn't organize based on apps but based on tasks, and those tasks shouldn't get equal visibility an an icon grid.