Double glazing was used in KLIA project. Do you hear the noise of aircraft?
DG is great for noise insulation. The rule of physics always applied, less movement, less wear. Make sure the DG window is tightly sealed cos noise travel by air. Condensation will come in too.
I'm not sure about the gas filled DG. What gas do they use?
Hope it helps.
Sound Proofing (double glazing windows), Are sliding windows effective? Renovations