I have EZD2, AD2 and SD3 (upgraded from 2). My choice is SD3, for me it's easy AND handy, very handy. Scalable, undocking windows, grid editor, tweakable into depth, the standard library delivered with SD3 is excellent. The grid editor is grouped by instruments, e.g. Hats, Toms, Snares etc. each in one folder, never see this before.