A well-made balloon whisk has more wires, correctly positioned, in the right thickness to incorporate air efficiently without tiring the hand. It sounds technical but is immediately noticeable: the number of whisking movements needed for stiff meringue or whipped cream is actually lower with a good tool than with a poor one. In a professional kitchen that is the difference between whisking one hundred portions and whisking one hundred and twenty.
Hestan's Provisions whisk is in 18/10 stainless steel, part of the range from the brand Thomas Keller chose for The French Laundry. Dishwasher-safe.