If walker sent my account/password to the auth server i wouldn't care, since (nearly) everybody was running his own server (l2asrv)...
Please don't understand me wrong, i really like to see an alternative to walker/superman. L2Divine has some fresh new ideas, and i'm sure DEV will enjoy us with interesting features in the future.
I just don't like to see my (game)password being sent over the net
I'm not sure about walker (but i will do a research on this) but i know that L2Divine is sending it and i know that L2Superman isn't sending it....
So a lot of blahblah... and the conclusion is: Use the program you like the most (or the program that you can afford :-p)