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There are many (loan) words which have both katakana version and pure Japanese
version.  
For example:

> report = レポート or ほうこく (報告)  
>  project = プロジェクト or じぎょう (事業)  
>  task = タスク or かだい(課題)

I read [What causes loan words to displace native words for existing
concepts?](https://japanese.stackexchange.com/questions/16245/what-causes-
loan-words-to-displace-native-words-for-existing-concepts) But that does not
clarify which one should I prefer over other?

Should I use katakana version for casual conversation and the native Japanese
word for formal conversation?
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usage loanwords
Usage of loan words in contrast with native Japanese word
On business, maney Japanese use katakana-English and Pure Japanese (came from
Chinese), and almost of them are believed interchageable but always has slight
difference each other. I can't reffer all of them here, but the policy is
simple "Use Japanese version as many as possible."

You must has realized that most of all Katakana-English are nouns.

> レポート = 報告、報告書  
>  レポートする = 報告する

Each Katakana-English does not always have the same meaning of Japanese
version.

> プロジェクトはプロジェクトで、これを事業とは言わない。

事業 is used in more broad sense than プロジェクト。事業 is devided into many projects
and rutine operations.

> タスクと課題も異なる。 そもそもほとんどの日本人は、task と job と workの違いを知らない（気にしてない）。

それに、

> 「課題と問題は同じではない」などとよく言われる。問題は「進行を妨げる諸々{もろもろ}」で、課題は「問題を乗り越えて先にすすむためのひとまとまりの仕事」
>
> タスクチームは、上述の課題解決のために設けられた組織（チーム）。

Once you learn Kanji-versions, you must memorize the original English terms
respectively. When Japanese use Katakana-version, you always aware of the
original English term and you can understand the difference among the
Katakana-version, Kanji-verson and the original English term.

Hope this helps.
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answer
I read an article from japantoday.com [Top 5 myths about learning
japanese](https://www.japantoday.com/category/lifestyle/view/top-5-myths-
about-learning-japanese). From the article:

> **#2. You need to use native Japanese words instead of borrowed foreign
> words**
>
> As we all know, Japanese has a lot of borrowed words in it that range from
> perfectly understandable to rage-inducingly absurd.
>
> But like it or not, those borrowed words are part of the Japanese language.
> Saying you don’t like them is the same as saying you don’t like the English
> words “admiral” (Arabic), “ketchup” (Chinese), or “jungle” (Hindi).
>
> And yet so many students insist on using the native Japanese equivalents of
> words when there’s already a perfectly-fine borrowed word ready to use. They
> say to for “door” (instead of “doa”), “daidaiiro” for “orange” (instead of
> “orenji”), or “taku” for “table” (instead of “teeburu”). They think it
> sounds more “pure,” but really they just end up sounding silly or outright
> wrong.
>
> Unless you think saying “Let’s eat seaweed-wrapped-rice-with-raw-fish”
> sounds better than “Let’s east sushi,” please don’t do this.

One of my Japanese friends said they always use `クラス` instead of `じゅぎょう`.  
I also read some facebook posts suggesting that these loan words are perfectly
ok to use.

**Conclusion**  
Loan words are now part of the Japanese language. We don't have to choose
native Japanese words over loan words.
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