VAT tax setup

Good day,

We are trying to setup VAT tax setup in JDE.  I went through the documentation and found
there are two ways we can handle VAT tax.

Document1 :  1276290.1
- In sales  through advance pricing,
In  purchasing through Landed cost rule

Document2:
1413283.1  - Work with Tax area
code.

Here in UAE, VAT tax is very simple which is 5% for all
items for the most of the customers.

Which method is preferable for VAT?  And what is advantage?

Since we are using here advance pricing and Landed cost, it
is easy to use by using Document 1 but I want to know if there is any pitfalls