Which is the best high school in the Frenchs Forest area?

Actually both Davidson High and The Forest High are located in Frenchs Forest. (Surprise!). Depending where in Frenchs Forest you live your local could be either one.
The best school depends upon what suits your child best. Try join a school tour. Talk with the principal and get a feel for the school. Both schools have different pros and cons.
Both schools will take kids who are out of area. You will need to complete a special form to enrol out of area and have valid reason for selecting differently but it usually is not a problem.

There is only one high school in FF. It is called Forest High. Some children also attend Davidson High (short 5 minute drive from The Forest High School.