I found criminal clients easy and matrimonial clients hard. Matrimonial clients hate each other so much and use their children to hurt each other in beastly ways. Murderers have usually killed the one person in the world that was bugging them and they're usually quite peaceful and agreeable.

Quoted in Sam Marsden and Chris Moncrieff, "Rumpole creator Mortimer dies at 85," The Independent (2009-01-16)