The One Simple Thing That Could Save Your Finnster Leaks Campaign - Postcolonial Perspectives
Scientists say this one simple habit could be the only thing you need to improve your life, and you have the chance ... The Mirror: One simple thing parents can do to make children 'more ready' for school One simple thing parents can do to make children 'more ready' for school YourTango: Research Shows People Who Do This One Simple Thing Every Day Notice A Surprisingly Energizing Shift In How They Feel Research Shows People Who Do This One Simple Thing Every Day Notice A Surprisingly Energizing Shift In How They Feel 0 The phrase 'one of the' is used to describe something/someone from the same group. There are many birds on the tree.
Understanding the Context
One of the birds is red. This means we are talking about all the birds on the three but then when you want to be specific about the red bird, you use one of the. He is one of the soldiers who fights for their country - is correct. "Which one is the best" is obviously a question format, so it makes sense that " which one the best is " should be the correct form.
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Key Insights
This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural. The 'one hand' could be any generic hand (no article) or a specific one (definite article). 'The other' refers to the 'matching hand' of the first one. There can only ever be one, and it is being referred to explicitly as the partner of the first, therefore it needs a definite article.