FB-111 was a solution searching for a problem. It was designed as a strike aircraft, fleet interceptor, airforce bomber, whatever...
It had a bomb bay, but the main gear retracted into the fuselage and took up a lot of valuable real estate for bomb loads.
It had a short range compared to the B-1. I think the only reason why it was in service for so long was because the airforce was forced to buy a fleet of them and didn't want to throw them away.
B-1 is a great bomber. Too bad we don't have more of them. And they'll be replaced by the B-52 soon. Just like the B-2 will be replaced by the B-52 in 2040.
