One thing to remember if you root in water is that once you've put the cuttings in compost you need to keep them in an open-topped plastic bag for a week, and well out of sunshine - otherwise, they are liable to wilt badly and be lost.
Kate, I've never found the slightest difference between water-rooted and compost-rooted plants unless I've let the roots get too long in water, when they can take longer to establish.