Any app I build in the future will be created on a droid powered device first. I have learned the hard way to shoot for the lowest performing platform first as it is nearly impossible to port the other direction.
Not entirely related to this posting but I would like to know why you have made this conclusion? I have ported an iOS application to Android and found it to be easier. In a way, it almost makes perfect sense that if you build an app on a locked down platform (foo) it should be much easier to port to a more open platform (bar) since you are "practically" guaranteed that bar will have all of the functionality of foo and then some....no?
"Consider a spherical bear, in simple harmonic motion..." -- Professor in the UCB physics department