Do jocks have anything significantly different about them than regular under, minus the fact that I can be pounded whilst keeping them on.
In general, they provide far better support.
From the time I was in seventh grade, we were required to use them in physical education. I continued to use them through college. Thus, it seems strange to me that many men now are not familiar with them. They used to be available at sporting goods stores and pharmacies.
There are different types of athletic supporters. Some have a pouch made from the same material as the waist band; they are less comfortable. The better ones have a pouch made from a softer and more comfortable material than the waist band.
The ones for swimmers have a narrower waist band so that they won't show. The others have a wider waistband.
There are some designed to accept a plastic cup (at one time they used aluminium cups); they are intended for use in sports in which one might accidentally be kneed in the groin, which can cause significant discomfort.
From posts on this sight, it seems that athletic supporters are less common than they once were and that many people now know little or nothing about them.