What are you opinions on high school teams running defenses with one safety in the middle of the field with alot of teams running the spread offense?
A lot of it has to do with the defense you are playing and who the opponent is. If you're going against a grind-em-out running team, that second safety could become a "monster man" or a strong safety, basically another linebacker. Against passing teams, you need that second safety as a cushion.
I personally like the two safety set up - maybe three at times because I've seen a lot of DBs get burned trying to play man-to-man...