At a glance
Aと Bと どちら～ asks "which is more ~, A or B?" It is used to ask about a choice or a comparison between exactly two things.
A と B と どちらが [adjective] ですか。
A の ほうが [adjective] です。
犬と猫とどちらが好きですか。 Which do you like more, dogs or cats?
How to form it
A and B are nouns. The pattern attaches to them like this:
| Part | What goes there | Example |
|---|---|---|
| A と | The first thing | 犬と |
| B と | The second thing. This と is optional. | 猫と |
| どちら / どっち | "Which (of two)". どっち is casual. | どちら |
| が | After どちら, before an adjective | どちらが |
| ～ですか | Polite question. Casual speech drops ですか. | 好きですか / 好き？ |
Both Aと Bと どちらが～ and Aと B（、）どちらが～ are correct. The second と is often dropped in speech, and a comma is often written in its place.