One thing I can guarantee is that no one helmet is certain to be quieter than another based on someone else's experience. For example: I have a Shark Spartan helmet that I dearly love, and it's
by far the quietest helmet I've ever owned. That includes Shoeis, Arais, a KBC, an HJC, and other Shark helmets. But if you look up reviews of the same helmet, you will find lots of people complaining about how loud it is. The same is true of most helmets, with some swearing one model is the quietest ever, with others cursing how loud it is.
My theory is simple: minute differences in how our helmets interact with the airflow around our particular bike can make big differences in wind noise. The factors are almost infinite, between our height, body shape (longer/shorter arms, torso, neck, etc.), bike, windscreen, suspension setup (front high or low), posture, etc. Some of the Brit bike magazines who love doing in-depth product testing don't bother getting too scientific about helmet noise because the results aren't reproducible or consistent.
That's not to say that some helmets aren't inherently quieter, as the less turbulence, the less noise. In contrast to the Spartan, my Shark Race-R Pro is quite noisy because it's covered in vents for cooling and fins for stability. But unfortunately I don't believe any one helmet can be guaranteed to be quiet for a different rider on a different bike.
All that to contradict myself by saying that generally, Shuberths are thought to be among the quieter brands, as they are less concerned than others with giving their helmets aggressive or otherwise style-driven shapes. Here's a Champion Helmets video on what they think are the 10 quietest helmets, but I wouldn't put too much stock in being guaranteed anything other than they're the ten quietest with that rider on that bike: