To a certain extent, depends on what you are shooting, and/or competition. Most of the time, I use Peltor and they make a range or muff types. As you know, they should all carry a DB rating to address the ambient noise. I like to limit the extension that would interfere with my cheak weld so I use an old set of shotgun muffs and when I need additional protection, I insert ear plugs. I also have higher DB rated muffs that I take along and most of these are industrial types. The point is to try and get as close to the DB rating as possible. One size may not fit all. Duration of exposure is also a consideration.
Be Safe !!!