Edited by fritz at 2015-11-9 13:41
Ahh,forgot to write why I have chosen a OTT H3 Box and not orange pi plus/2/PC.
It's the SPDIF out for digital audio DTS/Dolby.
In the orange pi plus/2/PC this output is not available.It's used internaly to enable power for the CSI port (CSI-PWR En).
Alternatively you could, if you're planning to use your opi 2, to pass (passtrough) audio via HDMI to the TV and then via SPDIF out to the AV Receiver/amplifier.
This however requires a TV with SPDIF output.
Regarding customization and booting linux distros. You can boot what you want on
any H3 device that has a microsd slot.

And don't forget that with linux you don't have Hardware video acceleration and this will not change in the near future!