I bought 2 pairs of Peltor Sport Ultimate Hearing Protectors to replace my 20 year old Peltor Ultimate 10s. They mainly get used when I'm running gas yard equipment, or as loaners to others when shooting pistols. They are incredibly quiet but absolutely too bulky for anything but standing pistol shooting. Double them up with plugs and you have now enter the "Quiet Zen Zone".
I use Howard Lights with Noisefighters for pistol practice and matches where I need to hear the timer and range commands. I also use them for shooting rimfire rifles on 100 yard steel so I can hear the hits and they don't get dislodged by the cheekweld on those downward sloping rifle stocks. They also work with my other lever actions and other rifles that have a good amount of stock drop.
For ARs and other straight rifle stocks I use old Peltor Shotgunner muffs with the scallop on the lower part and double up with plugs if I'm not shooting suppressed.
Even with the scallop, I have to position the cup as high as possible to keep it from getting dislodged. It's just the way my face and cheekbones work with straight stocks.
To summarize, the Ultimates are quiet as hell but useless for me when rifle shooting. The HLs are comfy for me with Noisefighters on some rifles but would need plugs added if indoors. For ARs I use have to the smallest profile muffs I can find and double up with plugs.