Wind noise is influenced by your head shape, helmet shape, height, bike design, screen height and design, wind strength and direction etc etc. What works for one person on their bike may not work for you. Simply try lots on and find the helmet that is the most comfortable and snuggest fit on your head, as the correct helmet for you is one that fits well and is comfortable. With the helmet on your head and straps done up, if you grasp the helmet and try to spin it sideways on your head, it should pull your face skin around with it. Grab the back of the hemet (straps done up) and try to pull it forward and off your head. It should not be able to come off, and if it does, it may come off in a crash, which is bad. Full face helmets with minimal vents seems to be the quietest, and flip front helmets, while popular, have a reputation for being a bit noisier. In a crash, a light helmet may be preferable to a heavy helmet, as less mass is swinging around on your neck. When touring, always wear hearing protection, as many of us are now paying the price for poor hearing protection from past years.
My previous helmet was a very expensive Shoei X-Eleven and it was the noisiest helmet I've ever owned, to a point where I gaffer taped up all the vents to try to quiet it down. I now ride with a Shoei TZ-R which has the reputation of being a quiet helmet. Wind noise is no longer a problem for me with the Shoei TZ-R, aftermarket screen and hearing protection.
If reduced wind noise is one of your main objectives, fit a Bike-Quip screen, and you find lots of post describing how effective they are.
