I disagree. If there was no advantage, why would they make the crown? The gases escape the barrel evenly with the crown. With a threaded barrel and a Flash Hider/Suppresser, the gas exits the barrel then the ports of the FH. With the half bird cage, the holes are on top, the gases escape through those but the gas escapes off the bottom of the cage where there are no holes. This uneven gas flow causes a change as apposed to the Crown. I have been told on the forum that it doesn't affect your rounds. I have been told by Bushmaster that it does. I ordered one to find out for myself. I had a barrel threaded at my local Gun Smith and attached the FH. When I took it to the range, I used the same ammo, same range, same everything except the added FH. My groups went from 3/8" MoA to 1" MoA. You won't see a great amount of difference but you will see some. I guess the question you have to ask is how much is acceptable for your application. Keep in mind that a 1" at 100 Yards is a 2" at 200 and 4" at four hundred, etc....
You'll hear a lot of different things from those who say they can't "tell" a difference but honestly it depends on how you "Gauge" a difference. I assume you are not looking for a super accurate rifle going with a "Kit" rifle so for that application, I would have to say that you probably won't "Notice" a difference.
Semper Fi