¿Con qué opinión coincide la vuestra?

[ROBINDESBOIS]

How can I say that in English?

[Perikles]

Again, context. If there are two or more opinions already known, then

Which opinion do you agree with?
Which opinion do you share?
With whom do you agree?

[poli]

What's your opinion? is a way of translating it in a less formal mode.

[Perikles]

What's your opinion? is a way of translating it in a less formal mode.I did wonder. But I thought it must have the context I suggested, because it does seem a very cumbersome way of saying "What do you think?"

[ROBINDESBOIS]

Perikles' answer iswhat I was looking for?