15.10.2021

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Use THE with superlatives such as "the best", "the biggest", "the most important", "the least interesting", etc.

Examples:

• This is the best day ever.
• That is the most expensive hotel room I've ever heard of in my life.
• He told the funniest joke!

Comparative forms, such as "bigger", "better", "more" can be used with both A(AN) and THE and follow general article usage.

Examples:

• I like the bigger roller coaster.
• He has a more expensive car than I do.

HOWEVER: THE is often used with comparative forms (bigger) rather than superlative forms (biggest) when comparing only two things. This is commonly used in phrases such as "the bigger of the two".

Examples:

• Jessie and Shauna are both smart. But I think Shauna is the smarter of the two.
• Between Jason's son and his daughter, his daughter is the better athlete.

https://www.englishpage.com/articles/articles_13.htm