Well I have them both and the 727 and find I alternate in order of preference between; 727 to 707 and 727 and must confess I have never touched the 767 except to make sure it worked, bit like the 747 what they call an old mans aeroplane, everything is automated and it drives itself and you just watch the world go by, I prefer it a bit more hands on.

But all being said and done, the 767 is a wide body aeroplane and the 707 is a narrow body. Different beasties for different times thats all!