I’ve just put up my latest post for the HP Application Security Blog, titled: 2 Reasons iOS is More Secure Than Android.
I think the first point is the most important, i.e. marketshare. Second to that is the platform security itself, which is both more variable and less important overall. Stronger security tends not to provide safety when you also have most of the scrutiny.
Anyway, check it out if you get a chance: