Which is better to use triggers or functions?

Question

PostgreSQL

When you insert data into a table, you need to keep a history of changes in it.
How it is better to implement it?
Write a trigger that will call the function for adding records to the history table or immediately the function that you call? When called, such a function will insert data into the main table and write history to another table.

Answer 1

well it is logical that triggers are more reliable than separately to pull function.