How Samsung stacks up against Apple, HTC

Pros and cons of Samsung's Galaxy S6 phones

Samsung unveiled its Galaxy S6 and S6 Edge phones at the Mobile World Congress this weekend, but they may not be enough to unseat the Apple iPhone 6 Plus in a mobile phone popularity contest.

The Galaxy S6 Edge features a curved screen, which Samsung said will create a more "immersive experience." Others are less taken by the screen.

"The curved edged screen is a gimmicky parlor trick," said Shelly Palmer, managing director of the digital media group at investment bank Landmark Ventures. "They got rid of the removable battery, which was the best feature of the phone," Palmer added.

Mark Spoonauer, editor in chief of Tom's Guide, also criticized the lack of a removable battery, but he lauded the Edge's screen.

"I love the way that they've put Gorilla Glass on the back and it reflects the light, so it seems like it's changing colors," Spoonauer told CNBC.