I'd say the second one.

Source: Tatoeba

Lesson Two is easy.

Source: Tatoeba

Lesson Two is easy.

Source: Tatoeba

Second semester has ended.

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The second lesson is very simple.

The second lesson is very easy.

Source: Tatoeba

Let's take up the second problem, shall we?

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I would prefer the second sentence.

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Second best is never enough.

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Your second button is coming off.

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It's at the third home in the second row of houses.

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I'm the second oldest of three children.

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Yokohama is the second largest city in Japan.

Source: Tatoeba

Which is more complete, the first edition or the second?

Source: Tatoeba

What do you think is the second highest mountain in Japan?

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What do you think is the second tallest mountain in Japan?

Source: Tatoeba

Saturn is the second largest planet in the Solar System.

Source: Tatoeba

Turn north, walk to the second alley, and you're there.

Source: Tatoeba

This is my first husband's second wife.

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Prince William is second in line to the English throne.

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The first group studies in the morning, the second in the evening.

Source: Tatoeba