The pcDuino appears to be based on an Allwinner A-series SoC. These have lousy open source driver support for hardware acceleration. There have been frequent promises of better support, but they have come to nothing. Other ARM platforms - like the Broadcom and AMLogic stuff - are much better supported, with active and engaged support for the Kodi community. Definitely avoid anything Allwinner based...
Yes stay away from Allwinner -- > Should be renamed
AllLoser when it comes to use as a Kodi Media Player.
If you need a device with 3D MVC (ie full 1080p 3D) and HD Audio decode support get a RPi2.
Need 1080p HEVC hardware decoding, get a ODROID C1+ (faster than a RPi2 as well)
I would also stay clear of anything associated with Allwinner, speaking from experience.
To answer your question, RPi is better ( but still far from perfect).