I'd have to go with RME over Topping, slightly more money... but I'd have piece of mind.RME is considered good, although overkill for even most studios.
If you don't need the features of these DACs you can probably spend 1/5 as much to get the same sound quality from Topping or whoever. Flat FR and -100dB SINAD sounds exactly the same wherever you get it. It is like asking which brand of 100% pure distilled water tastes the best. By definition, if it has a taste, something has gone wrong.