I always use a bubbler to root the larger cuttings like brugmansia because first there is a lot of oxygen in the water and I believe it's easier for the cuttings to take up water easier than in a moist substrate thus you get way less vascular collapse. Also with the constant movement and aeration of the water there is a huge reduction in stagnation.
The picture is of a brugmansia cutting I received that started producing pre-roots in less than 24 hours sitting in the bubbler.
