Rebuild. But re-take the tallest building title... go for the 2,000 foot range.
Take donations from all over. Use US taxpayers dollars to assist (& distribute rents accordingly).
The look need not be the same.
BTW, long before this incident, I've studied skyscraper construction, and would just like to point out that both towers
easily withstood the jetliners smashing into them.
The fire is what began to weaken the structural steel over a 1+ hour period. All modern steel buildings are constructed to survive the effects of heat in even a fierce high rise fire. And the Towers would have survived any indiginous fire. The structural steel is actually insulated to reduce the heat transfer while the fire burns out, or is put out by the suppression systems and/or firemen.
However, the WTC did not have structural steel insulation to enable it to survive 80,000 or 90,000 pounds of jet fuel in an inferno. BUT... it is quite possible to construct (or even retrofit) skyscrapers to meet even this threat. The main drawback is the cost involved. Suffice it to say, I favor adding the 3 to 4 extra layers of insulation to the structural steel of any replacement building, and we should probably retrofit other key buildings.
Something most people don't know, or don't think about is how both WTC towers stood for over an hour in the jet kerosene inferno. The "expected" time would have been about 30 or fewer minutes. Probably 10,000+ people were
saved because the WTCs were probably the most redundant and structurally sound large skyscraper in the world.