I use a GTX-D(g) wpo in my ss system (Vitus/Magico/Jorma). The Magico S5's are already highly resolving and fairly neutral in tonal balance, so I decided on the gold version to add a touch of warmth and body. The general recommendation I received was rhodium was best for tube-based systems, or very warm ss or warm ss rigs where you don't want to 'risk' going any warmer. And gold for neutral to warm ss systems.
Note however, there is NOT a drastic difference between these, despite the plating difference & urban myths doing the rounds on this forum. The major mojo is in the base metal (pure copper), and the slight lean towards warmth vs resolution in the gold vs rhodium (respectively) is more related to a slight 'shade' vs night/day difference.
Note however, there is NOT a drastic difference between these, despite the plating difference & urban myths doing the rounds on this forum. The major mojo is in the base metal (pure copper), and the slight lean towards warmth vs resolution in the gold vs rhodium (respectively) is more related to a slight 'shade' vs night/day difference.