Do not think that if storage tower is called in that way, it's the best place to find ammo. If you want 9mm ammo, go to Military tower. Over 1/4 of teh tower can be explored for free due to the layout bugs. If you want 12g ammo and 0.44 ammo, go to engineering tower. If some of them is lowlight/radiation - do not try to exlore them, it's only a waste of medkits. Also, security and main towers are the good storage of exp, so do not forget to visit them. Do not visit potential resourse robbing towers, like storage and civilian, unless it's the endgame.
Hope this helps