In plain words
Nor do we know which is better for us—that we conquer them or they conquer us. The very sons of Dhritarashtra, after killing whom we would not wish to live, stand before us.
Word for word
And we do not know this, which [of the two] is weightier for us: whether we should conquer, or whether they should conquer us; the very ones having killed whom we do not wish to live, they stand in front, the sons of Dhṛtarāṣṭra.