I use a Nolan 4 in 1 (N44)
I own more than 1 motorcycle and ride in different ways: road, off road, touring.
I like the Nolan because it has one of the biggest openings so your peripheral vision is not impaired. Even though the chin bar is removable, I don't. I swap between the peak and the visor depending on how cold it gets and what I'm riding. Takes about 20 seconds. The new model all the different modes require very little fiddling, except for removal of the chin bar.
It is now 6 years old and I suppose it is due for replacement. Beside a few minor marks, it still looks brand new and I like how the intercom system is almost not noticeable. I don't care much for the Robocop helmet look.