Test results: GPU performance
All of these benchmarks, save for the off-screen test of GLBenchmark, run at the native resolution of each phone, and vSync limits the maximum frame rate to 60 frames per second. The lower resolution of the HTC One gives it an advantage in these tests over the other three phones.
The off-screen tests show off the raw computational power of the GPU. The somewhat older Mali 400 MP GPU in the Galaxy S3 does quite well still thanks to the increase in clock speed, and leads the way ahead of the ULP GeForce in the Tegra 3 and the Adreno 225 GPU in Snapdragon S4 from the HTC One S.