High Pros:
Safe
juice conservative
High Cons:
Less satisfaction to some
coils get gunked easier
Low Pros:
More heat = more vapor production, flavor, throat hit / overall more intense experience.
Low Cons:
Too low can be dangerous, always know the resistance of your coil and the amp limits of your battery.
Faster
juice consumption
I'm sure there are a ton others, but these are the main bulletpoints.