The word 'どちら' is often used in polite contexts to ask about a choice between two options or to inquire about a direction or location. It is more formal than 'どっち'.
どちらが好きですか？
Dochira ga suki desu ka?
Which one do you like?
どちらに行きますか？
Dochira ni ikimasu ka?
Where are you going?
どっち (docchi)
which one
どれ (dore)
どこ (doko)
where
