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Understanding the Context

You may use one-to-one when you can identify a source and a destination. For eg., a one-to-one email is one sent from a single person to another, i.e., no ccs or bccs. In maths, a one-to-one mapping maps one element of a set to a unique element in a target set. One-on-one is the correct adjective in your example.

Key Insights

See Free ... "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. This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural. On the one hand, I really enjoy pie, but on the other hand, I’m supposed to be on a diet. Both of these expressions use each hand to represent an opinion, as if weighing the pros and cons of each choice with the hands as the scale.

Final Thoughts

idioms - "On one hand" vs "on the one hand." - English Language ...