I owned both. I loved the Silkworm, but the TRL cable caused me to sell the silkworm after the first week.
Yes, I am selling the TRL now, but ONLY because I can't use it's lengh in my new rack. The TRL cable is quite stiff.
I forgot to mention this cable as a past one I have owned. I have owned to many:-)
Anyway the TRL/FIM sliver has far better dynamics and punch. It is also more transparent and delivers more weight and scale. It throws a far wider and deeper stage.
The Silkworm is a tad warmer and the highs more "set back".
You can take my comments with a grain of salt if you like as I do have the TRL Silver for sale and some may think I am "selling".
That is not my intent. Both are good. I found the TRL simply opened up more of the music and got more out of the way.