upthread i mentioned Julian Krauses very interesting testing of various studio audio interfaces.
another one ive come across that might be usefull is audio science review who
use test and measurement gear on interfaces....eg....
ssl 2 mk2 interface tested (and a topping interface also..)
https://www.audiosciencereview.com/forum/index.php?threads/solid-state-logic-ssl-2-mkii-vs-topping-pro-e2x2-otg-audio-interfaces-comparison-review-and-measurements.60675/if one pages down after conclusion are various ASR site posts etc.
also fyi...they have a ton of other audio products they test....
includeing convertors etc etc.
hope this helps someone in the market for a new interface.
om