In the end, though, it's all about what people like. And I haven't heard one thing from Pocrupine Tree which I like that wasn't done better previously by Pink Floyd. Sure, Porcupine Tree have done things that don't sound like Floyd, but those are the things I generally don't like. Bonnie the Cat comes to mind.
Saying I like PT better than PF would be like saying I like Rush better than Zeppelin-- but only because I love Rush's first album and don't care for the rest of the stuff.