I no longer have the ST-10s Black Gold, and I actually sold them before I got my RW-2000, so I never had the chance to A/B test the two.
Did a quick search and found @baskingshark 's brief comparisons between these two.
https://www.head-fi.org/threads/earbuds-round-up.441400/page-3604#post-16353329
Maybe he can chime in if these impressions are still true, having owned both of them for some time now.
Yep it still holds true, RW2000 is an upgrade over the smabat ST10S black gold in mids and treble and technicalities and soundstage.
Black gold wins in bass quantity and extension. Black gold is way harder to drive too and needs an amp, so one area to think about if you don't have a powerful source.
Basshead will like black gold, but black gold is also cheaper than RW2000, so cost is another area to factor in.