I have LG OLED65C8PUA and have been testing multiple topping dacs. First started with E50 and really liked it until I started to notice the stutters.
E30II - No stutter but I prefer the sound of ESS chips. (2xAK4493S)
E50 - Stutter (ES9068AS)
DX7 - Stutter more frequent than E50 (ES9038PRO)
E70 - Stutter with the default settings. more frequent than E50 similar to DX7 (ES9028PRO) No stutter when using synchronous mode though. Unfortunately, the other DACs do not expose this setting. I looked at the chipset documentation and ESS seems to provide this feature.
I am using NAD C 356DAC amplifier with a DAC module. I think it has burr brown on it. The difference between the built-in DAC and the topping DACs is quite noticeable but it's not like listening to a different pair of speakers. I would say Burr Brown has more isolated frequency ranges (vocals for example) and topping has more controlled bass. (Not sure which one is better) Though the output levels of NAD and toppings might not be the same, I might be hearing that level difference. Between the toppings DACs, E30 has a slightly different sound and this is probably due to the chipset. I was not able to notice any difference between E50/DX7/E70 and I don't think that the better specs these models have can be heard by the human ear.