Isaac -- my experience has typically been that the largemouth bass almost always will outcompete the smallmouth bass. Often, the smallmouths will disappear entirely in a few years. I assume that it happens either through predation, competition, or both as the largemouth will be far more piscivorous than smallmouths under most conditions. The smallies sure are fun to catch, and if you want to keep them, you may want to catch&release smallies, and harvest largemouths? However, if you have a panfish present (such as bluegill), only the largemouths have the predatory capability to keep them in check. So, I'd protect the largemouths in that case.
