Blade-style flags (aka "Wind Blades", "Feathers" "Feather Banners" "Bow Flags" etc., etc.) are best for most kind of messaging, including wayfinding, since they display linear copy better than teardrops. As for branding, it all depends upon the orientation of the creative. For horizontal logos or for stacked presentation of multiple logos, or for logos positioned atop or below linear copy, blade-style flags are best. Blade flags also tend to move more in the wind than teardrops, creating added visual interest.