The Custom Molded Earplugs have a continuous noise reduction rating of 31. They are designed for consistent noise reduction across all decibel ranges.
The Percussive Filters are designed to block out loud percussive noises while still allowing ambient noise to pass through. Attached is a chart with the filter noise reduction rating so that you can see the different ratings at the different levels.
Both are going to be good options. It will be up to your personal preference if you want specific protection against loud, sudden sounds or protection across the same range.