I think it is Borodin Quartet. In my opinion this one is better than Emerson String Quartet, which seems to be more "cold"...the recording by BQ is more "musical". The second movement by Emerson is fragile in interesting way, that somebody can appraise and I think they have better tempo in the 4th movement (faster), but on the whole is better Borodin Quartet.

What do you think?

Well, I am not big fan of Russian music (especially romantic), but I am passionate admirer of Russian interprets...

I've always like the Amadeus Quartet's recording of the DATM (it's also coupled with a superb reading of the "Trout" quintet with Emil Gilels on the keys). And yes, the Quintet in C is marvelous. And, since the discussion seems to have turned to chamber works in general, I'd like to mention the brilliance of the Bartòk quartets- truly one of the top 10 essential 20th century works.

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Take a look at the Bandit's blog, The Classical Corner.

Death and the Maiden.... I love the third, it's sooo powerful!

In my opinion and for what I've heard, I will answer the Alban Berg Quartet.
I love the piece and there are so wonderful interpretations.

Takacs Quartet.

I very much like the Takacs. Wonderful performance on the Verbier Festival this year.