Their report, issued Friday morning, is based on Apple and Samsung mobile ad impressions in the U.S. and Canada, several hundred million in all. Among its findings:

• Despite Apple’s larger installed base in North America, the 2013-model iPhone got snapped up almost twice as fast as the 2013 Galaxies. (See first chart.)
• Despite the slow pick-up of its new model, Samsung’s dominance of the North American Android market continues to grow. (Second chart.)
• Over the course of 2013, Apple’s share of mobile Web traffic, as measured by Chitika, grew to 67%, more than double Samsung’s. (Third chart.)

Chitika’s conclusion:

Both Samsung and Apple are well positioned to maintain their top spots in the mobile marketplace, but usage statistics, in conjunction with sales figures, make it clear that each company has its own set of strengths when it comes to North America. Continental usage of Apple products generally outperform its market share, likely indicating that users are highly engaged with the company’s devices as compared to those of its competitors. Samsung has invested heavily in the North American mobile marketplace, and its devices easily drive the most Android Web traffic. This makes the user experience on its devices of prime concern for Android OS and application developers, helping Samsung deliver a more seamless experience to its users.

LINK: North American Usage and Adoption Comparison: Apple and Samsung