What is the SAP Recommendation? Agile or Hybrid Agile

What is the proposal regarding the Agile Methodology? 

Does SAP urge axenic Agile oregon Hybrid Agile? 

Our enactment is presently transitioning to S/4HANA and we needed immoderate clarification connected the Agile methodology. We are not definite which attack to take.  In the past we person chiefly utilized the waterfall attack for our releases and method upgrades. 

Questions 1

What is the SAP recommended attack for ERP Delivering System migration and method upgrade. Does SAP urge Agile oregon Hybrid Agile approach?

Could you delight supply nexus to documentation and supply accusation what is the SAP recommendations? 

Questions 2

What is the SAP recommended attack for improvement of Fiori apps. Does SAP urge Agile oregon Hybrid Agile approach?

Could you delight supply nexus to documentation, and supply accusation connected the SAP recommendations? 

Thank you