The Cubie eeks out the Hackberry in the latest revision, if you're interested in CPU power. Allwinner A20 rather than A10.

All of the Allwinner boards have mostly-closed Mali GPUs and closed but partially reverse-engineered CedarX VPUs.

Outside of Android the Mali GPUs are a bit of a bear to get working at all, much less use for anything useful.

For headless tasks I agree that Cubie/Hackberry are faster dollar-for-dollar than the Pi, but the Pi's VideoCore GPU, while still blob-encumbered, at least provides a documented interface with working drivers for both the "traditional" X11 stack and Android, as well as a real OpenMAX video decoding interface.