might be good to do both.  i have a list that i printed that i carry w/ me on all rides in case something happens.  i got the list from the nextel numbers thread.
For the hurricanes last year I printed that whole Nextel thread out incase we lost power and needed it. You can't ever be too safe. 
I would just worry about people using the numbers for the wrong things...Like theives or cons or something crazy in this world