In addition and like the Pi 3, the NanoPi A64 has onboard WiFi, so connectivity to internet streams or to local resources on your LAN is already included - no head scratching to figure out if your WiFi dongle will be supported by the OS! This provide flexibility for audio reproduction that the Pi platform just cannot offer. This means that if the quality of the onboard codec is not sufficient, you should be able to connect an external DAC with SPDIF input to the board. See the section "Layout" in the WIKI for the NanoPi A64 for more info. One interesting difference between this board and the Pi is that the AllWinner chip also provides an SPDIF output, and this has been brought out to a GPIO pin on the board. I have used a similar onboard codec on a different AllWinner based board and I have been pleased with the sound quality (but again have not done any actual quantitative testing). The chip's 24/192 codec means that you don't need to add a DAC, although I have yet to test the output for audio performance.
On paper this seems to be roughly equivalent to the Pi 3 in terms of processing power, however, the AllWinner chip includes onboard audio, and FriendlyArm's board brings out the DAC lines to a headphone jack. This uses the four-core A64 chip from Allwinner. One that recently caught my eye was the NanoPi A64 by FriendlyArm.
It seems that every month or two a new flavor of single board computer (SBC) is launched.
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