となる vs になる - Grammar [duplicate]

Question

There is a whole video describing the grammar but its in Japanese .

How would you explain the difference between:

彼がリーダーとなった

And

彼がリーダーになった

Answer 1

The expression になる is mainly used to express a "natural" change, while the となる expression is used to express a change to a final stage.

First example: 彼がリーダーになった: He became a leader (naturally). 彼がリーダーとなった: He became a leader (he finally made it, maybe struggling, maybe he had to face a lot of challenges, etc.).

Second example: 夜になったら、雨が雪になった: When the night came, rain turned into snow (If I am in a snowy area, this is naturally expected). 夜になったら、雨が雪となった: When the night came, rain turned into snow (If I am NOT in a snowy area, this might not expected).

Hope it helps.