The most immediate advantage is that dbscan requires you to choose a specific density level, while level set trees don't. This means that with LSTs you can see

The most immediate advantage is that dbscan requires you to choose a specific density level, while level set trees don't. This means that with LSTs you can see the clusters at any density level without rerunning the algorithm, and in fact obtain clusters at different density levels. The dendrogram representation of the LST is also a useful visualization for densities in more than two dimensions.