I will use NestedSets model since it provides the fastest way to get tree branches from the DB and not that expensive for creating operation (we don't need to move comments within the tree or even branches so we will definitely avoid the most expensive nested sets operations).
I will use NestedSets model since it provides the fastest way to get tree branches from the DB and not that expensive for creating operation (we don't need to move comments within the tree or even branches so we will definitely avoid the most expensive nested sets operations).