I've owned a few electronic muffs. An old Peltor Tactical, a newer Sordin "Supreme Pro", and the Peltor "Comtac".
The best protection was with the Peltor Tactical, but the sound wasn't too good back then (I'm sure they have an upgraded version now). The Sordin has good sound, but I have found it to be a bit too tight on my head, which kind of squeezes my ears too much. So I've given it to my wife, as they fit her better. Finally, the Peltor "Comtac" is what I've ended up using most, as it fits me best. The only downside is that I feel the electronic sound isn't able to be amplified as much as with the Sordin.
Whichever you decide to look at, I'd suggest you try them all on for more than a couple of minutes, to see what you feel is most comfortable. This is important if you want to wear them for any extended time while hunting or shooting.