Smartphone Madness 2015: OnePlus One vs. HTC One M9

Senior Editor

EDITORS' NOTE: Congratulations to the OnePlus One for taking 66.14 percent of the vote against the HTC One M9. The OnePlus One will advance to the finals, which will begin on Friday, April 3 at 10 a.m. ET. Today you can vote in the other semi final match between the Microsoft Lumia 640 XL and the BlackBerry Passport.

Now that BlackBerry's victory over the Samsung Galaxy Note 4 has come to a close, our Smartphone Madness 2015 competition is officially down to the final four. Kicking off our semifinal round is a literal One-on-One between two sleek Android heavyweights: the OnePlus One and the HTC One M9. Which phone makes it to the finals? You have until Wednesday, April 1 at 9 a.m. ET to cast your vote.

A ruthless underdog, the OnePlus One has already defeated the Apple iPhone 6 and Samsung Galaxy S6 Edge -- two phones that we thought could take the whole competition. This phone's dominance in our polls is no fluke, either. Packing a slick design, a rich full HD display and a sharp 13-megapixel camera, the OnePlus One offers everything you'd want from a flagship phone for a mere $300 unlocked.

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Though it's on a hot streak, the OnePlus One faces some serious competition from HTC's all-new flagship. The HTC One M9 refines its predecessor's beautiful design and slick interface, offering a lighter body, a crisp 1080p display and an extra-sharp 20-MP camera. The phone's new Sense 7 UI makes it the most personal HTC One yet, as you can enjoy personalized recommendations, such as restaurant suggestions, based on your location.

So which One gets to be the One? Cast your vote between now and April 1 at 9 a.m. ET to represent your favorite.