Hi. There are several advantages and even more if you aim to assemble several BioBricks.

I found this nice explanation at addgene blog : hope it helps you to clarify :

"Advantages of Golden Gate cloning

Golden Gate cloning is one of the easiest cloning methods in terms of hands-on time, as digestion and ligation can be done in one 30-minute reaction. The destination vector and entry vector(s) are placed in a single tube containing the Type IIS enzyme and ligase. Although the original destination vector + insert may spontaneously religate, this transient construct retains functional Type IIS sites and will be re-digested. In contrast, formation of the desired ligation product is irreversible because this construct does not retain the enzyme recognition sites. As a result, the ligation process is close to 100% efficient. Another strength of Golden Gate cloning is its scalability. Unique 4 base overhangs can be used to assemble multiple fragments - up to 10 fragments are commonly assembled in a single reaction! These overhangs specify the desired order of fragments, and the loss of enzyme recognition sites after ligation favors formation of the construct of interest. Although efficiency may decrease with an increased number of fragments, or the ligation of very small/very large fragments, these problems can be overcome by screening a higher number of potential clones. Golden Gate assembly has a few advantages over other cloning methods. Exonuclease-based methods like Gibson assembly require 20-40 bp of homology at the ends of DNA fragments to specify assembly order, so fragments with 5’ or 3’ sequence homology cannot be assembled using this method, but can be assembled with Golden Gate. The popular Gateway cloning system produces constructs with an attB recombination scar encoding eight amino acids, but Golden Gate assembly can be designed to be scarless. Golden Gate assembly is also less expensive than many commercial cloning methods."

This technique is time efficient, the product of its ligation is not reversible and most time quantifiable among other reasons. Their ligation most times is close to 100 percent if not 100 percent.