I'd have to agree. I've seen far more android phones out in the wild than I have seen windows phones. In fact I can count on my hand how many times I've seen a window phone, and I work in San Francisco, so can't use the excuse that I am out in the middle of no where. (Though truth be told, Iphone still reigns supreme here)
The main reason I think that people prefer the Iphone, is it is very easy to use, and every update and fix is spoonfed to you. Android has alot more options, but requires a little tinkering, something that many consumers are not too keen on doing. Which is rather sad when you consider that there are step by step tutorials that show how to do everything a google search away.
Though I have to say I've had an iphone since the 3g up until the 4, and I am pretty sick of the whole thing. Probably going to get an android next.