I’ve been a longtime Giro wearer and have had Atmos, Ionos, Prolifht and Aeon. Aeon fits very similar to Atmos and is my favorite, however it isn’t cheap.
I would move to another Giro, but they all have the new rocloc5 and it sucks. I have had to replace it twice already in 1 helmet before I sold the helmet after replacing it the last time. It keeps breaking in the same location, the little knob’s pivot point breaks. That’s why I’m starting to look at other brands.
I think aeon from giro is the best, ionos second, and the top end specialized Prevail tied for second. The specialized is more narrow on the head, meaning if you fall and bang your head sideways you could damage your ear. But this probably makes prevail more aero.