The Silkworm + and the Gabriel are equally robust and flexible in my opinion,with the Jade being flexible, but not as robust in build. For the record my Jade cables never broke but they do need to be treated with care. I know all 3 would take good care of you if there were any build issues, but time out of system for repair is a valid consideration.
In my system and to my ears they all soundstage and image well, more alike than different I would say, but I preferred the KCI for it's more natural sound on everything and I listen to a lot of singer/songwriter type of vocal music. They delivered the most satisfying and toe-tapping sound to me. But that's my system, my ears, and my preferences, so again I would encourage you to audition them as possible.
In my system and to my ears they all soundstage and image well, more alike than different I would say, but I preferred the KCI for it's more natural sound on everything and I listen to a lot of singer/songwriter type of vocal music. They delivered the most satisfying and toe-tapping sound to me. But that's my system, my ears, and my preferences, so again I would encourage you to audition them as possible.