I think Pink Floyd and Queen really are in a different league than the rest of those. I like them all ok except for maybe Panic At The Disco (because I don't really know them). Rob Thomas I like as the frontman for Matchbox 20, not for his solo stuff.
But anyway, between Pink Floyd and Queen, easily my favorite is Pink Floyd. I have all their stuff. I like the songs you can just melt into, with dynamite guitar work by Gilmour.
By saying "who is better", it's implying that you are comparing two and only two things. The correct title of this thread would be "who is best", because that implies that there is hierarchy among the choices, and that there are more than just two choices.