My preferred pencils are Derwent, from left to right, Coloursoft, Artist and Studio. I’ve used Derwent exclusively for fifteen years and see no need to try any other brand; they really are as good as it gets. Coloursoft and Artist are round cased, Studio have hexagonal casing.
One of them doesn’t ever roll off any surface, land on the floor and crack the lead inside the casing. Two of them do. Although, the casing is pretty solid and offers good protection, it is a pain crawling under tables and easels to find dropped pencils.
(Derwent’s reasoning for this is that the Studio are hard leads and generally used by draughtsman who use sloping drawing boards so have to have non-rolling pencils.)
Just one of life’s minor irritations. It’s nothing in the great scheme of things but hey…