Because they only know that brand, so they drop its name so they can feel like they know what they are talking about.
I like Burton gear, but they are by no means the best. They are neck and neck with a bunch of other brands, many of which you listed.
As for Antwan, what an idiot:
"STOP being a hater. HAVE you ever ridden a burton custom. YEA I DIDNT THINK SO. Dont get mad b/c you cannot afford a burton."
Is he serious? He thinks if you don't ride Burton it is only because you can't afford it? And if you say they aren't they best you are hating because you are poor? What an idiot.
I can't stand people like him. Dumbass snowboard instructors who suck at riding but think they are so good because they got some 3 day certificate to teach people falling leaf.
I bet he is the guy who goes off the 60foot tabletops, but only lands 10 feet from the lip, and claims a 60 foot jump.
And yes, I HAVE ridden a Custom. It is one of my favorite boards, but guess what? I like the Gnu Riders Choice better. That board IS my favorite board.
And one more thing, if you have been riding it for 5 years, and it hasn't lost any of its pop, it means you are not riding very hard you idiot. A good board will hardly last a season riding it hard and going big. Even your favorite Burton boards.