I have had both types. Generally the American Labs I had were taller, heavier and harder headed. The one British I had was large for his breed but still smaller that the Americans. He was a very sensitive dog, almost too sensitive unless treated very gentle. Check your breeder and get to know their bloodlines and see both in field before you decide. The Brit I had was more affectionate and a better family dog than the American Labs I had but the Brit came from a much better bloodline than the Americans I had so it probably is just more of a bloodline thing than a breed thing. Generally less health issues from top quality breeders whichever breed but as of right now, probably fewer problems with the British lines since they are newer in the states and the bloodlines have not become as corrupted as some of the American lines, IMO.
