The Black one sounds obviously much better.
@oktatracker has MKI and MKII (AE).
Any thought?
Bear in mind in 1872 when the OTmk1 was announced the quality of MP3 compression was far inferior hence the gritty sound. 
The soldering tin used on the MK1 units had small traces of precious metals due to a metallurgic anomaly Elektron has yet to reproduce and thus the sound inside travels a bit faster and thus the unit has lower latency.
I like this one. Love my MK1.
What I can hear is, that the inputs on mkii are slightly louder. But nothing different enough in audio input or output that it should matter. Lots of other more important differences (oled vs larger screen, build, encoders, design, shortcut buttons, button shape, quality of parts, size with I/O ports, etc.).
Is there something wrong with the build, design or quality of parts on the MK1?
Mki is IMO build better than mkii. But Elektron states, that the longevity of the parts used in mkii is better. Designwise, there are a few threads pointing out the placement of the buttons on the mkii as being poor design - but one of the trades they had to make, with the redesigned button shape.
It all depends on which one you have your audiophile rocks sitting on
ah, right. totally agree, i love the mk1 box design while digitakt and mk2 leave me quite cold
hello ancient thread bearers of past times - i have something to say on this matter thusly:
i feel mk1 ot was a fucking killer product that i couldnāt get to grips with at all, i tried many many many times and it catch on with me - now suddenly the first time having mk2 and everything just makes so much sense - i even think it sounds better no joke i do
I went from the mk1 directly to the mk2. traded someone here, actually. I didnāt A/B them, but I didnāt notice a difference in sound either. the interface is way better on the mk2 though, youāre right there. too many button combos on the mk1, that if I didnāt use a function for a couple weeks, Iād forget how to do it. there are some like that in the mk2, but far fewer.
