Of all the dreams you have ever had which one has affected you the most?
When you think of all the dreams you have ever had which one stands out the most?
例文１「今まで見た夢の中で、どれが一番印象に残ってる？」というニュアンスです。
of all the dreams you have ever had で「今まで見た夢の中で」
affect は「（人に）影響を与える・（人の）心を動かす」
例文２「今まで見た夢を思い出す時、どれが一番印象に残っていますか？」というニュアンスです。
stand out で「際立つ・目立つ」
「夢を見たことがありますか？」は
Do you ever remember having a dream?
Have you ever had a dream?
と言えます。
ご参考になれば幸いです！
This answer is the most direct and easiest way to ask someone what the most 'memorable' dream they have had is.
The word 'best' can be substituted for 'most memorable' or 'most unforgettable'.
What is the most memorable dream you have ever had?
memorable' is the term we would use here to refer to something that is 'easily remembered'. You could also use words like 'unforgettable'. Using the term 'most' specifies that the question is asking about the one dream that is the easiest out of all the dreams to remember. 'Dream' is the term referring to the series of images or thoughts occurring when a person is asleep.
What dream stands out to you the most?
どのような夢が最もあなたに際立っていますか？
What dream do you remember most?
どんな夢を一番覚えていますか？
We can use 'stands out' or 'remember most' to express the most memorable dream, they are used in the same way.
What dream stands out to you the most?
（一番印象に残っている夢は何ですか）
What dream do you remember most?
（一番印象に残っている夢は何ですか）
最も印象に残っている夢は、'stands out' や 'remember most' で表すことができます。
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