Let me tell you that every module in SAP has its own importance. Youn just has to choose the right module of SAP as per your interest and educational background. Now let's understand the importance of both the modules of SAP one by one:
SAP MM i.e. Material Management): The term SAP MM stands for material management and as the name suggests, it manages material required, processed and produced in the enterprise. Different types of procurement processes are managed with this system. Some of the popular sub-components in the SAP MM module are vendor master data, consumption-based planning, purchasing, inventory management, invoice verification and so on.
Want to learn SAP MM from scratch! Have a look at this right video on SAP MM provided by Intellipaat:
If you are more into reading then have a look this informative material on SAP MM:
SAP PP i.e. Production Planning: SAP PP is also one of the important modules of SAP that includes software designed especially for production planning and management. This module also consists of master data, system configuration and transactions in order to accomplish the plan procedures for production. SAP PP module collaborates with master data, sales, and operations planning, distribution resource planning, material requirements planning, product cost planning, etc., while working towards production management in enterprises.
Want to learn SAP PP from scratch! Have a look at this right video on SAP PP provided by Intellipaat:
If you are more into reading then have a look this informative material on SAP PP:
You can conclude based on the above data that both SAP PP and SAP MM are integrated modules. As per me, the best way to get success in SAP is you need to go step by step learning procedure as PP is an integrated module for MM then if we first work in SAP PP module is better to go for SAP MM.