The difference between Face-to-face and One-on-one
When used as nouns, face-to-face means a meeting, especially a meeting between two people conducted in person as opposed to a meeting conducted at a distance through technology, whereas one-on-one means a contest involving only one player on each side, especially of an activity often involving teams.
When used as adjectives, face-to-face means in one another's presence, whereas one-on-one means involving direct communication between two people.
Face-to-face is also adverb with the meaning: while physically present.
check bellow for the other definitions of Face-to-face and One-on-one
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Face-to-face as a noun:
A meeting, especially a meeting between two people conducted in person as opposed to a meeting conducted at a distance through technology.
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Face-to-face as an adjective:
In one another's presence.
Examples:
"a face-to-face meeting"
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Face-to-face as an adverb:
While physically present.
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One-on-one as an adjective (chiefly, North America):
Involving direct communication between two people.
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One-on-one as an adjective (sports):
involving one attacker and one defender
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One-on-one as an adjective (mathematics):
bijective or injective
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One-on-one as a noun:
A contest involving only one player on each side, especially of an activity often involving teams.
Examples:
"Why don't we play a little one-on-one until the others show up."
"He was willing to go one-on-one with the District Attorney himself."