How to choose the best transparent audio interface for the QC

Hi, I’m currently using my Quad Cortex through a Scarlet 2I2 gen 1, and I’ve been trying to route the QC directly to my Studio monitor instead. I noticed a huge bump in terms of sound quality, as if my AI was muffling the sound of whatever other crap filtering it does.

My issue is that I absolutely need an audio interface and don’t want to use the QC as the audio interface, I just can’t for many reasons. So my question is, what do I need to look for when searching for an audio interface that would not deteriorate the sound quality of the QC like the Scarlett does ?

The original RME Babyface has been rock solid for me.

Apollo hands down. The ability to load plugins directly on the interface makes a huge difference.

SSL 2 Plus is really good, too. Lots of headroom ,transparent sound, high signal-to-noise ratio.