I have several sets of electronic and non-electronic muffs. I prefer the non-electronic muffs with a NRR of greater than 30 ( I use Remington brand muffs). I have owned Peltor 7s muffs which died after a year and a half. They would not respond to phone calls or emails when I tried to contact them for repair. I also own a pair of Pro Ears- they seem OK but are not as quiet at the non-electronic ones.
So to summarize- I use the electronic muffs if I am taking a pistol class where I need to hear range commands, and I use the non-electronic muffs for all my other shooting. Good luck.
Merry Christmas- oldandslow