i had them both in early/mid 2020, sold both within a month - was the d90 mqa model and the akm-chipped rmeÂ
they sound similar, extended top, leanish mids, decent but somewhat nondescript bass, not much harmonic richness, i preferred a chord 2qute and then an ayre codex, then a schiit gumby to either, all more musical less overtly digital sounding
neither the topping nor the rme could image properly, narrow and shallow
rme is a good headphone amp though, and that manual gave no quarter to the old bellsouth yellow pages ...😂