My friend and I were discussing his front door locks. He has two separate Mult-T-Locks on his front door, one above the other, seperated by about 12 inches. They are not keyed the same, and this is where we have differing opinions. He says it's better to have the locks keyed differently because it provides a higher level of security. I say they ought to be keyed the same for convenience sake and that having them keyed differently does not provide higher security. If he loses his keys and ID he will lose both keys, so what's the point? I say one key for both locks is the way to go.
Who is right?