How do I decide which of these to use in a given situation？
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2021-08-09T21:29:55.240
88843
2021-08-12T03:09:17.500
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word-choice
なしでは　なくしては　Difference
Personally, I think the word "なくしては" emphasizes the necessity/requirement of
something, more than "なしでは".

I don't know if there is really a difference, but for example, let's say you
have a sentence like this.

  * "地図 **なくしては** 、この地域を旅する事はできないだろう。" → " _Without a map, it would be **impossible** to travel through this region._"

  * "地図 **なしでは** 、この地域を旅する事はできないだろう。" → " _Without a map, it would be **difficult** to travel through this region._"

In other words, "なくして（は）" is an absolute requirement, but "なしで（は）" are
necessary.

(Please keep in mind that this is just what I think it is, I don't know if
it's really true)
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2021-08-10T02:42:03.287
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2021-08-10T02:42:03.287
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answer
I would say it’s safe to assume the difference is only in register. なくしては
sounds formal and literary compared to なしでは and なしには, which are neutral.
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2021-08-12T03:09:17.500
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2021-08-12T03:09:17.500
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answer