B2,F104 and long range AT sniping
The B2 was designd as a first strike weapon for a nuclear war. It could in theory destroy know launch sites as an opening shot on anuclear exchange. If we ever need to take out North Koreas weapons program the B2 will be worth it's weight in gold, wich some people say it's the cost of the bomber anyway.
The other options were cruise missiles and Trident SLBM, but in a nuclear war the flexibility of a manned stealth platform would be very valuable.
The F104 has a bad rep, but not totally deserved. It was a very bad (dog)fighter, but as a fast climbing bomber interceptor it would have done nicely to shoot down any incoming M4 and Tu95 that had came it's way. When it was replaced in that role by the Much Superior F106 the basic frame was turned into a high speed tactical strike naval strike/recce aircraft. Yes it crashed in large nunbers, but in the 60s flying fast at low level was a dangerous bussiness. The Spanish Airforce, that flew different tactical profiles, operated F104 without loss and without complains. For the (OK, limited) purpouse of dropping tactical nukes on soviet tank regiments the F104G was a valid choice until the Tornado came along.
Was it the best? No way. The Bucc was the best low level strike plane of it's day.
On the field of long range tank kills, the 88L71 is credited with 3000m+ kills in russia, and there is little too choose for pure AT performance btw the 88L71 and the 128mm. a 4000m direct hit on a tank is a very rare and fortunate event, and not a very good base for assessing the combat value of a weapon. On the JagdTiger side, late in the war Porsche fitted one with their 16 cylinder 700HP diesel engine, and that would have improved the big fat cat a bit.
I would still rather have more standard Tiger IIs