Looking on the internet deeply has found these results:

works best is the most popular phrase on the web.

works the best 139,400,000 results on the web	works best 159,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I just want to work for the best, sir. Linseed oil works the best on maple furniture. Professor Robins only works with the best. And I only work with the best. Everything works out for the best. Work is the best thing for age. You liked her work the best. For depression, charity work is the best.	THUMBELlNA: I suppose it works best... ...if two people are about the same size. What works best is not clear. It works best if you put it in the upper thigh. Influence works best when we're unaware. Tiger Balm works best for bruises. This practice works best when the training role is included in the job description of these officials. Also, it works best with a warrant. Thirdly, it also shows us that NATO works well, and indeed works best, when the United States is focused and gives clear leadership.

works the best

139,400,000 results on the web

works best

159,000,000 results on the web

More popular!

THUMBELlNA: I suppose it works best... ...if two people are about the same size.
What works best is not clear.
It works best if you put it in the upper thigh.
Influence works best when we're unaware.
Tiger Balm works best for bruises.
This practice works best when the training role is included in the job description of these officials.
Also, it works best with a warrant.
Thirdly, it also shows us that NATO works well, and indeed works best, when the United States is focused and gives clear leadership.