Static
Encode one store URL if you only have a single listing.
App makers and marketers
Create an app-store QR that opens the correct listing for iPhone or Android. Change those URLs later, and track scans from posters and ads.
Live preview
Static
Encode one store URL if you only have a single listing.
Dynamic
Send iPhone and Android to the right store, and change those URLs later.
Analytics
Track scans from posters and ads.