What to used sqlit or core data?

As I'm new to data base in iOS. I had doubt which data base is to be used??

In my app there are 4 tables and they are connect to each other means

Tables:

1. New_Task : new_task_id,project_id(Foreign-Key),priority_id(Foreign-Key),task_name,sub_task,start_date,complete_date,assigned_to_me,assigned_to_other

2. Project : project_id,project_name,color

3. Priorities : priority_id,priority,color

4. Label : label_id,label,color

So, What should used Sqlite or CoreData???