Largest internal payload.The B-1B Lancer is the Air Force's bomber backbone. It has the largest payload capacity of any aircraft in the fleet, is multi-mission capable, and can carry and deliver huge quantities of both precision and nonprecision weaponry.
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B-52 can carry more, because of the external mount points.
B-1's external mount points were banned by one of the nuclear treaties. But B-1 is no longer a nuclear platform.
They've started using one of them for a targeting pod, and there was talk of freeing up the others for weapons. No idea if they've ever done anything about it.