UI5 and ABAP are both technologies used by SAP for developing business applications, but they serve different purposes and have different levels of complexity.

UI5 is generally considered easier to learn than ABAP, as it requires basic knowledge of web development technologies and some experience with JavaScript programming.

ABAP, on the other hand, is a server-side technology used for developing the business logic and data processing of SAP applications.

In short, UI5 is easier to learn than ABAP, as it requires less specific knowledge of SAP's enterprise-level programming and database design concepts, and is more focused on web development technologies. Here is the Demo video: