I have used both the Peltors and the Howard Leights, and they're both good quality. They are easy to maintain and they work well. The HLs are less expensive. If your goal is significant noise reduction, you'll have to combine muffs with ear plugs. Otherwise, electronic muffs - or any muffs for that matter- have their limitations to how much noise they will reduce.
I currently run TCI DEHP Pro-X muffs, which are the same as the MSA Sordin Supreme Pro-X, but built specifically for TCI with their communications equipment. I also run the gel ear seals, they make a world of difference. The audio quality is 10x better with those high-end muffs than they are with the Peltors or HLs. However, the noise reduction is not much more significant. I just get a better seal around my glasses frames. With that said, I would never spend $279 on a pair of muffs for my kids unless they were older and more dedicated to not only shooting, but to taking care of their equipment.