heres one to think about - bead heads work better for most people because of the weight of the fly offsets the anglers ability.
in other words, a weighted fly gets into the strike zone easier, faster, and doesn't take as much technique and hydraulic knowledge. Hence the confidence bead heads get. I'm guilty.
I fish bead heads on every outing. I go back and forth on weather its the attraction of the metal or the weight.
Part of me leans more towards the weight.
Think about the hydraulics - water moves slower at the bottom due to friction, so a weighted fly will actually move slower because it will cut through the water easier and be less suspectable to be influenced from the leader within the faster water to be pulled up or perpendicular to the flow. But then i have more confidence in silver and tungsten than gold which I'd say is a result of pressured fish seeing more gold, so that leads to attraction.
So, basically what i finally figuring out is it just comes down to presentation and what you comfortable using. So, I think its easier to get a better presentation with a weighted fly. Whats everyone else's thoughts - weighted and unweighted?