Adfonic claims Apple's platform currently generates 45 percent of all ad impressions on its network, with iOS enjoying particular strength in both Europe and Asia.
Three is family
Android, meanwhile, is the biggest platform in the US with a 46 percent share a number that runs very close to Millennial's assessment of the market helping Google's OS into second spot on a global basis with a 38 percent share.
When it comes to the devices behind the platform, the biggest three handsets in the market are iPhone, iPad and iPod touch, giving Apple a clean sweep of the top three.
The most popular Android handset on the market in Samsung's Galaxy S II, with the BlackBerry Curve 8520 leads the way for RIM.
But, crucially, Adfonic points out that, when it comes to click-through rates of ads, bigger doesn't always means better.
Microsoft, for instance, is a particularly strong player the firm notes, despite its OS not yet challenging at the top table when it comes to market share.
"Although devices using Windows Mobile or Windows Phone 7 operating systems make up a small proportion of global ad impressions, it is interesting to note that these operating systems demonstrate very positive click-through rates," Adfonic concludes.
You can download Adfonic's report in full from the ad network's website.