I have always found banana pi to be superior in terms of value for money.
However note these important things:
- Longterm support (former models still being sold)
- 100% backwards compatibility (RPi1/2)
- fully open source stack including GPU driver
Broadcom's VideoCoreIV driver has been open sourced by Broadcom making the RPi well suited for future developments like Mir and Wayland. In contrast, the Banana Pi has a Mali GPU without a proper open source driver (lima development seems currently halted).
ARM/Mali open source driver situation explained: http://libv.livejournal.com/26635.html
List of ARM GPUs and driver status: http://en.wikipedia.org/wiki/Free_and_open-source_graphics_d...