I love them all!!They are all unique with different ways of communicating with you.If you look closely they all have a sense of humour too. Thats a very difficult question as I have seen some dogs that I could see great potential for rescue work,movie work,cadaver dogs etc. However the owners did not really "KNOW" their dogs well enough to see its greatness.I am a firefighter and when my yellow lab sees me put my uniform on he knows that he won't be going with me, however when he sees me put the blue jeans on he knows he will be with me wherever I go. I did surprise him once and took him to the fire station and he stayed overnite.
To answer your question....keeping in mind its the dog owners that usually screw a dog up....the good all round dog for children,field and water work including tracking and great kindness is the Labrador Retriever. My Labs name is Beau Regarde. This is French for "good looker". Incidentally thats all the French I know. Take care.