Let us know how you like the viborg. I haven't seen anything to make me think they are better than other Chinese connectors other than they gave them a name.
TBH, I just bought the Viborg connector that goes to the wall because it was the only one for my country that uses copper for all the components of the conductor. All other brands use brass.
As far as the IEC plug, I admit I chose the Viborg one because it looks really pretty and it's a reputable brand. The conductors are made out of copper and plated with oxygen-free copper, silver, and the final plating with rhodium. It cost me like $35.
The Viborg IEC connectors with plastic housing cost much less and since the interior components are the same, they cost around $23.
There is another Chinese brand called Monosaudio. They also have an aluminum housing IEC with copper conductors and they use 4 different platings: copper, silver, palladium, and rhodium. It is about $7-$10 less expensive.
All the other Chinese brands just use brass and then plate it with gold or rhodium.