Which apps - built in or from App Store do you l think you either benefit from 3D Touch or should have more options.
For me it's:
Music: customise playlist shortcut
Messages: customise - i.e. "New Message to Mum"
MyFitnessPal: add new food
Fantastical: new event
Google Maps: take me home
Facebook: new post
For me it's:
Music: customise playlist shortcut
Messages: customise - i.e. "New Message to Mum"
MyFitnessPal: add new food
Fantastical: new event
Google Maps: take me home
Facebook: new post