I have heard a lot of yammer.. HIGH COOL is my choice.. And here is why.
The fan on auto will cycle between low high and off. this is very annoying sound wise as you hear every change and never "Filter" the sound out.
Fan on constant HIGH your brain quickly filters out the sound and it gets to the point where you do not even notice it (or at least MY brain does that. NOTE I have Ducted A/C's)
Next is an argument I often get in.. What causes the A/C Evaporator to ice up?
One theory is low air flow caused by either one or both of the following:
Fan on LOW and dirty intake filters.
That is not MY theory but it does appear to have some truth.
So HIGH COOL is my choice.