So the torque curves for the 5.4 show slightly better low end torque than the 5.0.
That's not encouraging.
I guess I'll get the 3.5. 420lbs at 2500 rpm is hard to beat.
I drove a 5.4L 3v for about 10 years and have 26k on a 2019 5.0 and there is absolutely no comparison. My 5.0 will smoke my old 5.4 in any category you could think of. There might be some data floating on the net somewhere saying what you mentioned but in the real world the 5.0 kicks the 5.4L tail all day.