lol - I just went through EXACTLY the same thing your going through, just the other day. I was promoting Kixtart (for a revamp of a sister companys login scripts) and one of the sister companies developers was pushing vbscript. So we decided to write the same script, using both languages, and management would decide ...

The winner was ... Kixtart ! Three big reasons given ...

1) There was no appreciable difference in speed - although I argued that Kixtart should be much faster for group-based processing (especially when we're talking many-many groups) - vbscript doesn't have the magical group cache - and I'm convinced that it does make a big difference.

2) Ease of use and supportability ... lets face it - Kixtart is much easier to understand then vbscript is. Many of the functions required for login scripting is built native into the language. Many of the commands/functions are DOS-like. Kixtart is the perfect language for network admins to support day-two.

3) Kixtart flys under the radar ... given the stigma around vbscript, and the probability that maybe (one day) vbscripts will need to have certificates associated with them (given that vbs is a big virus tool) ... in the long term, vbscript was deemed to be too high maintenance.

You may agree or dis-agree with these comments - my two cents.