Qualcomm Snapdragon S4...
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Qualcomm considers Snapdragon as a platform and very similar to ARM architecture. Snapdragon dubbed their product series as Scorpion. They have gone through S1, S2, S3 and the latest S4 series.

Snapdragon is the chip of choice for Windows Phone and preferred by manufactures like HTC and Nokia. Qualcomm’s dual core chip is highly efficient to the extent that while benchmarking, its performance stood almost equivalent to quad core. Another feature that stood out is efficient battery life which can be attributed to the chips design. The latest series S4 introduce latest quad core technology. With quad core variant of S4 recently introduced, this processor is going to rock smartphone and tablet market.
Qualcomm Snapdragon are the best for better battery life and if you like playing HD movies.