Lightwave - Just making purdy renders fast. Also Ultra precise with numeric inputs, where Maya rounds off to the nearest thousandth. Maya - Everything else and scripting.
MAYA drag and drop images from windows explorer into hypershade to import whole folders of textures at once. This is much better than having to browse to find textures. so many maya features i love but that one saves me soooooooo much time.
max - attach object, literally never found anything in maya that does quite the same job, so feckin good when working with instances maya - decent selection tool, doesnt select the poly next to, or behind the camera, pretyy rock solid all the time