I don't like polys with crisp feel. I prefer a really soft, cushy almost mushy feel from strings. And Panthera is a crisp feeling poly, although not uncomfortable it's just not up my alley.
Although Panthera is a control oriented string it still offers ample power.
A full Panthera setup is for bigger hitters who want to retain control but have a bit of a boost in the power department.
As for Black Venom, it is one of my favourite polys.
Dynamic, comfortable, soft, nice spin but I hit flat so not the best to judge.
My go to poly, so to speak.