I have to add my opinion to this topic......
First, a top level club team from South Carolina and a top level 4A or 3A high school team would probably have a pretty high level, good match. In a series of 5 games, i would say the club team probably wins 3 with at least one going to penalties. However, there are some high schools from out of state who would do the same thing to the club team.
Second, I cannot fathom a scenario where a "B" team would defeat a top level h.s. team. I would take the h.s. team over the "B" team 4 games to 1 with one game going to penalties.
Here is another prong to this discussion-- since club soccer has not always been at the level it is currently at here in S.C., let's take the following hypothetical match-up...
one of the best high school teams of all time versus one of the best club teams of all time.....
girls: Riverside 1993 versus Mt. Pleasant Ice 2000 (or their best state championship team)
boys: Riverside 1993 versus DSA's Regional Finalist team (to this date, S.C. most successful club team)
girls #2: Mauldin versus one of GFC's State Champions
boys #2: Irmo 1989 versus Bridge FA's US Club Soccer National Champion