According to Carton, the top reason why those consumers said they would buy the Samsung smartphone was the size and quality of the screen.
Yesterday, Samsung revealed that it had sold 10 million Galaxy S III handsets globally in its first two months of availability, a mark the preceding Galaxy S II took five months to reach.
When all Samsung phones are taken into account, the Asian company's fortunes are even brighter: 19% of those polled who said they were planning on buying a smartphone in the next 90 days selected Samsung as the maker.
That's an all-time high for Samsung in ChangeWave's tracking, and nearly four times that of a year ago.
Other smartphone makers scored poorly in ChangeWave's latest survey, with just 4% of those polled citing Motorola and 3% HTC as their vendor of choice. Motorola, which is now owned by Google, was down two percentage points from a March poll, while HTC was flat.
Nokia, which has tied its success to Microsoft's Windows Phone mobile operating system, was up one point from March to 2%, said Carton.
The dominance of Apple and Samsung -- especially the former -- among consumers planning future smartphone purchases pointed to a two-horse race at this point, said Carton.
"The huge wave of pent-up demand for the coming iPhone launch has important implications for the rest of the industry ... and puts a number of second-tier smartphone manufacturers at increased risk of coming in below plan for the year," Carton said.
Apple has not announced when it will launch the next iPhone, much less its name or feature set. Most experts, however, expect the company to follow the same schedule as last year. Apple introduced the iPhone 4S on Oct. 4, 2011, and started selling the device on Oct. 14.
If the company hews to the 2011 timetable, it would announce the new iPhone Oct 2, 2012, and kick off sales Oct. 12.
Sign up for CIO Asia eNewsletters.