Contact core/exposed core/taper core were all the rage for a while. Ken Smith was an early advocate IIRC. I believe he shipped his basses with taper core strings...B and E.
I've tried them several times through the years and always go back to fully wound strings. The last set of contact core stainless strings that I tried were on my G. Gould ggi6. Geoff prefers contact core strings and I didn't care for them at all. I put a set of D'Adarrio XL's on that bass and it sounds fantastic. However, one of my friends also bought a ggi6 and he liked the stainless contact core Gould strings just fine and he certainly sounded great playing that bass with the OEM strings.
So, I am not much help. Most of my basses have XL's on them. By the way, D'Adarrio XL's are the OEM strings for Roscoe and Keith recommends NOT using contact core strings because he says they do not intonate correctly. That has been pretty much my experience. YMMV