ASTC (Adaptive Scalable Texture Compression) is the Google’s officially recommended texture compression for Android, with the prerequisite of supporting the the Android Extension Pack (included since Lollipop, ~84.7% distribution of Android devices are running beyond this version):
On the other hand, Apple supports ASTC since the release of the A8 processor:
Plus they have announced their future iOS devices will not use PowerVR GPUs, meaning the widely used hardware accelerated pvr formats would no longer be advantaged in the near future.