which one of the two sounds more correct to you?

Question

1-As my contractor you have the full/total liberty to use any materials which you think works better, please go ahead and do it

or

2-As my contractor you have the full/total freedom to use any materials which you think works better, please go ahead and do it

or any better option you may come up?

Answer 1

first one

Answer 2

3

without permission

 [singular] something you do without asking permission, especially which may offend or upset someone else

take the liberty of doing something

I took the liberty of cancelling your reservation.

 

4

 be at liberty to do something

formal to have the right or permission to do something:

I am not at liberty to discuss these matters.

 

1 [uncountable and countable] the right to do what you want without being controlled or restricted by anyone [↪ liberty]:

freedom to do something

We do not have the freedom to do just what we like.