OK, the gradations of the shadows to the right of her nose are ever so slightly softer in #2, the transitions more gradual, and I suspect that might be the more even illumination coming from the bare bulb D-Lite 2 inside the softbox. Then again, it might have the opposite effect! If I had to bet a dollar... I'd bet on #1 being the Speedlight! 
That said, there's nothing between the two, you will never see the difference in real-life shooting.



