I suppose the question is how you have defined "heavily" or "favored," or where you get your data at all.

Mobile browser statistics from Oct. 2010 through Oct. 2011: http://gs.statcounter.com/#mobile_browser-ww-monthly-201010-...

And mobile OSs: http://gs.statcounter.com/#mobile_os-ww-monthly-201010-20111...

I work for isohunt.com, we get ~4 million visits a day and Android is at 44% while iOS is at 43% with Android growing ~1% each month. What's important is the visitors to your site, are their using more iOS or more Android or are they both at the same level more or less?