Speculation before Apple's iPhone 6 launch event last week was for the new phones to be made with more durable sapphire glass screens, a feature that Apple didn't deliver, but the new iPhones seem to have enough selling points that consumers are still clamoring for the phones.
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"With the iPhone 6 and 6 Plus, people are getting a bigger screen, a faster processor, more enhanced camera and I think that puts a lot of pressure on Samsung ... Apple has two devices that go up against the Galaxy S5 and the Note 4, and on paper, Samsung has better specs and better features, but there's something about Apple's ecosystem that keeps people coming back for more," Spoonauer said.
The first iPhone 6 smartphones will make it into consumers' hands this Friday, but since demand for the devices outpaced Apple's initial supply of the phones, preorders for the iPhone 6 Plus won't be filled until later this fall, until November if you're ordering online, Spoonauer noted.
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"Between the two devices, the iPhone 6 Plus seems to be the most exciting of the two because not only do you get the bigger screen, but you also have optical image stabilization in the camera and you have a really cool dual-pane effect when you're looking at apps that take advantage of a larger and sharper display," Spoonauer said.
The list price for a 4.7-inch iPhone 6 starts at $199 and the iPhone 6 Plus starts at $299.
—By CNBC's Althea Chang