Processing Power Out of the three, the Z1 compact is the most powerful of the bunch. The handset offers the same high-end specifications from its larger sibling (the Xperia Z1), including a Snapdragon 800 quad-core processor clocked at 2.2 GHz, an Adreno 330 graphics chip and 2 GB of RAM.
Meanwhile, both the S4 Mini and the HTC One Mini come with a Snapdragon 400 dual-core unit and an Adreno 305 GPU. The HTC chip runs at a frequency of 1.4 GHz, whereas the S4 Mini has a higher CPU frequency: 1.7 GHz. The One Mini comes with 1 GB of RAM, which is 500 MB less than the S4 Mini.