The true advantage of using an audio interface over a mixer is usually clarity. Also you mentioned mixing in the mixer and not the DAW. If you mix in the mixer and the send to the DAW a stereo mix you can’t change it as much. Maybe some overall EQ, or compression but if you record each track dry to he DAW then you can mix and master with greater options. Maybe the drum track or tracks need a certain fix the is different from the bass, or piano or guitar panning has far more options in the DAW.

If you Mike drums or have more than one guitar or several vocal tracks each group can have their own fax buss. But if you do all that in the mixer you are stuck with that. What ever our decide on make sure it gives you simple but many options for mix down and mastering. As Charlie said a good mixer with multiple in/out can rock. Here’s the $64 question is this to track just you or a group of players?

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