The choice between a teardrop or blade-shape flag is usually one of aesthetics.  Some people simply prefer teardrops. In a graphic sense, teardrops are best for round or square logos that best fit within the wider portion of the rounded shape. If linear copy is required, teardrops present an awkward design challenge, and a blade-style flag is probably the better solution. If you don't want your flag to flutter in the wind, a teardrop shape is the better of the two choices.