I believe a part of it is dependent on the earth its sitting on; which is why companies do soil boring tests, to see if the loads of the soil in that specific area can handle a large building. Also don’t forget that the Far West Side isn’t as plentiful in Manhattan Schist Rock as the rest of Midtown. MW sits on a very small foundation that’s anchored to the ground because of the train tracks that run adjacent to it, hence the steel being bolted above that instead of it rising at the same time as the concrete core, like at 1 WTC. With 3 WTC it might also be due to lower costs and the different construction trades working on the building. Look how much faster 3 WTC rose compared to MW because 3 WTC steel rose with the concrete core until the core took off. 30 Hudson is pretty much sitting above the train tracks as opposed to MW, hence the all steel construction. Also means it’s a bit more expensive, but it’s the only feasible way. So partly money, partly engineering and partly the earth.
Fun stuff from architecture school lol. I hope I’m right! Haha. Correct me otherwise.