When it comes to wine what's your favourite country?
例文１「ワインはどの国のが好き？」というニュアンスです。
What's your favourite country？ で「どこの国が好き？」となり、最後に for 〇〇 と付けることで「〇〇はどこの国が好き？」と言えます。
例文２「ワインに関して言えば、どこの国のが好き？」という言い方です。
when it comes to~ で「〜に関して言えば」
ご参考になれば幸いです！
Where do you think the best wine producing grapes can be found?
Well, the best grapes produce the best wine, so if you find the country with the best wine producing grapes, then you will, inevitably have discovered the best wine. It is however, a matter of opinion and personal preference.
Which country's wine do you drink the most?
→どの国のワインを一番飲みますか。
「which」は「どちらの、どの」という意味の形容詞です。
「which country」で「どの国」となります。
「どの国のワイン」は「which country's wine」と表しました。
回答は一例ですので、参考程度にしてください。
ありがとうございました
Which countries wines do you prefer when it comes ot choosing wine?
Personal taste determines our preferences and favorites...
When it comes to wine, some countries have a better reputation than others.
France used to be considered "The Wine Country" close followed by Spain and Italy!
These days however wine is grown all across the world and it may well have Become much harder to answer this question clearly ;-)
"What countries wine do you prefer?" and "From what country do you prefer their wine?"
These two questions are asking from what country around the world, is you favorite wine.
To 'prefer' something is often used to suggest what is your favorite or most liked.
"What countries wine do you prefer?" や"From what country do you prefer their wine?"は、どの国のワインが好きかを聞くフレーズです。
'prefer' （～の方が好き）とは、何か好みかを聞くときによく使われます。
Is there a particular wine you like from a particular country?
The two sentences you see provided above are excellent ways to ask your listener if they like a certain wine from a particular country. In the first sentence you will see the term in your opinion. We use this when we want to know what a person's opinion is. This is a term that is used in our everyday conversation, it would make a great addition to your vocabulary.
これら2つの文は、どこか特定の国のワインが好きかどうかを尋ねるフレーズです。
一つ目の文には、in your opinion（あなたの意見では）というフレーズがあります。相手の意見を聞きたいときに使います。日常会話でよく使うので覚えておくといいでしょう。
This sentence seem like a natural way to phrase the question.
'Which' is a way of asking for information that suggests the answer is from a range of categories - in this case countries. The second part of the answer makes it clear that it is that you are interested in and the way that your favourite wine (object) relates to the country (subject).
日本 
イギリス 
アメリカ合衆国 
