Do you have a special reason why you compare the Digiface USB with a PCI card ?
Is it only because of the price to stay around €400 and not to go slightly higher for an AIO at €619?
I think it would be better to consider a PCIe card like the AIO, as otherwise you will be limited when looking for PCs/mainboards, because only a few boards support the old PCI slots.
Digiface USB is interesting for these reasons:
each of the 4 ports can be switched to optical SPDIF, which makes this interface very flexible and unique
it uses the new DIGIface driver, by this one driver you would have also direct access to other recording interfaces connected to your PC, you only need to look that they are clock synched (UFX+/UFX II, MADIface XT/Pro/USB, OctaMic XTC, ADI-2 Pro/AE/FS/DAC, Digiface USB/Dante)
for mobile use, needs no power supply
no breakout cable required
The AIO has these advantages:
connected to PCIe bus, under a loaded system maybe a little less likeliness of audio drops compared to USB, although my experience with the UFX and UFX+ is, that the USB drivers are very very good, at least with my system I see no big difference when running a load test with an insane number of recorded channels: https://www.tonstudio-forum.de/blog/ind … cks-de-en/
expandable and also cabable of supporting AES and MIDI
the AIO phones outputs look slightly better in terms of SNR / THD
it has dedicated outputs for analog out and phones
the analog output is servosymmetric, supports balanced and non-balanced connections
In terms of audio quality of the phones output I would make a side by side comparison with your equipment, if this is of interest to you.
It needs to be mentioned that the Digiface USB has only one analog output, TRS unbalanced.
So you can only connect speakers OR phones and you can't connect near field monitors with a balanced cable.
Shall you have such a requirement, then you need to take the AIO (or the PCI card).
Win7, CubPro 9.5, HDSPe MADI FX/OPTO-X, UFX+, Octamic XTC, ADI-2 Pro/DAC, RayDAT, ARC USB