I currently have a Shoei Neotec, a Shark Evoline 3 and an AGV.
The Shoei has a flip up front, a built in, flip down sunvisor, fits nice n snug, with a Sena 10U fitted,
http://www.sena.com/product/10u/ , ventilation is adequate . . It was a very hot journey riding to Perth in March this year and the helmet was OK, but it was a hot trip. I like the helmet and am tending to use it for most of my riding.
The Evoline 3 is also a flip up but it also flips right over to the back of the helmet giving you an open face configuration . . This change can be made whilst on the move using one hand . . I mainly use this feature whe it is hot and I have slowed down for a town or road works, I tend not to use open face configuration at much above 60KPH. This helmet also has a built in sun visor and ventilation is adequate without being an airconditioner . . I have it fitted with a Sena 20s,
http://www.sena.com/product/20s/ . Noise level is OK, but earplugs should still be worn.
The AGV is a full face non-flip, built in flip-down sunvisor I bought compare the noise level with my flip front helmets . . It is slightly quiter, I use it occasionally for shorter rides, but tend to prefer one of my flip-up helmets on longer rides. I have a Sena 10 fitted to it for coms, telephone, music etc . .
I wear earplugs or Earmold active earplugs when riding,
https://www.earmold.com.au/recreational-sports-headsets/new-recreational-stereo-headset-from-240.htm , . . I have had many helmets over the past 50 years of riding and have yet to find a quiet helmet. I wear earplugs to protect what little hearing I have left.
I also have a Sena Prism action Cam which I mount either on the helmet I chose for the ride or mount onto the bike in varying locations . .
http://www.sena.com/product/prism/