As someone a bit seasoned and suffering some hearing loss, I want to stop it from getting any worse...
If you need the electronic ones, be advised that most are very limited in their noise control. When shooting anything bigger (9mm+), I try and double up with foam too. If you don't need the electronic ones, then by all means go with the higher db rated passive muffs. I tried a pair of 32db at an indoor range and was really impressed with how quiet the range was
I have peltor 6 and they are very limited... and battery changing is tough. I also have the Howard Leight R-01526, which are a little better, but instead of cutting off the amplified sound like the peltors, they limit the amplified sound... both have their advantages. The HL's also have an input jack, which will be great for cutting the lawn