Sorry, I missed the info that you already have the MC Preamp. Then there is probably still the question about the quality. Well, the AIO Pro FS has just been reworked, as you probably know, and has converters from AKM built in.
You don't do anything wrong with the card and the differences in the converters are not that big anymore. From the technical data the AIO is really great, have a look at the data.
Later on, you can always upgrade to an ADI-2 DAC or Pro, if you think you need the features of these products.
And ... With the AIO you would have a card that supports TotalMix FX, and with it you could even connect an ARC USB. Then the routing can be adjusted very nicely via the card / TM FX.
Many ways are possible, in case of doubt: try both.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14