I finally got around to trying a (new) set of Bel Cantos.
I guess it goes without saying by now, that they are one of the most unbelievably wonderful strings to bow. They are also the most play-ready string I've ever played, right out of the pack. But the pizzicato response is very quiet, polite and (a first for my bass) too dark. If I had to use one word for their pizzicato sound, it might be "tubey". (BTW, I like tubes and analog sound). That might change (as most strings do), but on this basis anyway, a full set of these wouldn't work for me as a multi purpose (hybrid) string.
I did like the pop on the front of the note very much. The Bel Canto E just didn't work at all for pizzicato - could barely get a sound out of it.
In contrast, a full set of Flexocor Deluxes bow just about as easily, yet offer a more vibrant and complex (in the midrange) sound with a lot more bottom end, both arco and pizzicato. They are more open-sounding in general.
I just thought I'd report in on my experiences of both these sets on the same bass, since they appear to be pretty similar designs. I think I read somewhere (maybe on TB) that the FDs were Pirastro's response to the quick rising popularity of Bel Cantos?
On a different bass, the BCs are probably awesome thru 'n thru, but my bass (a pretty nice, 30's-40's carved German gamba bass) chooses FDs.
Ironically, in working my way back to the full set of FDs, I'm experimenting with FDs on the bottom and BCs on the top, which actually works (and gives you a bit of the niceness of both), but because they're both pretty expensive sets, it's not enough to justify keeping both. If I had 2 basses and a steady orchestral gig, I probably wouldn't hesitate to put BCs on the orchestra bass.
So maybe now I'll stop stressing (and spending) and just play. Like the folks I've read here on TB who go down the string hole and end up going back to their 10 year old set of Spirocores ...