"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. One-to-one is used when you talk about transfer or communications.

Context Explanation

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.

Insight Material

See Free ... With one or more is / are, the first thing to consider is whether 'one or more' is a unit or analysable. It has the near-synonym 'some'; 'four or five' could be substituted reasonably by 'several'. Which is correct: "one or more is" or "one or more are"? The first one is the indefinite pronoun referring to country —that is, one country, a country.

Final Conclusion

The second is the indefinite pronoun denoting an indefinite agent—it might be replaced with somebody or anybody or (usually in colloquial registers) you. Still in still life has the sense not moving. Still lifes (not still lives!) are works of visual art which depict inanimate objects such as ... word meaning - How is "one" used in different contexts? - English ... Which one is grammatically correct or better?

I have two assignments, One of them is done. I have two assignments, One of which is done. I watched a video tutorial that the teacher said the ... pronouns - "One of them" vs.