Geshelli Archel 2 is another great candidate, no line out though, requires a switcher for using it with speakers on the same systme.
I think a good comparison with this topping range is the JDS Labs EL range - EL AMP II plus JDS EL DAC II.
The D50s has the upper hand in the DAC department but not sure about the A50 as I’ve not seen any measurements on ASR to compare them.
I think the EL AMP II is going to be hard to beat measurement wise by Topping, but will the difference be audible is to be determined.
JDS have the all-in-one combo of their two as well ELLEMENT II.
I went with the topping range as I had the D50s already and as I’m in Hong Kong, currently, I thought they’d be easier to get and maintain from here.
It’s great to have all these choices.