The way I see it, one of the big strengths of Kixtart vs WSH (for login scripting) is Kixtart's "builtin" support for querying domain info (fe: group membership) over the network - and without the need for having an extra package(s) installed on the wkstn (under 9x Kixtart uses RPC calls and under NT NETAPI calls). WSH on the other hand requires a seperate install of the DSCLIENT (WinNT provider) on 9x and NT to support this basic functionality (afaik).

-Shawn