Oracle and OS (again)

I just posted the following message, just to see that the posting front end ate away my host.
So here we go again.
Sorry for the bother.
(Just to be sure: my net address is zorat_at_cs.unitn.it)

Hello net friends:

I have a question that perhaps many of you can answer:

Picture the following situation: a network of about 150 PCs (banyan Vines network, Compaq 3/486, windows 3.1, ...) Most of the PC need access to some common data bases taht will be implemented in Oracle.

The question then is: Oracle for which Operating system / environment / machine?

The choices are basically between installing Oracle under DOS, OS/2, Vines (is it possible????), or Unix.
I presume that Unix should provide faster response to queries (coming from the PC's, through OracleCard or similar), but does any of you have any practical experience and/or numbers to support my guess?

Thank you in advance.

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				Alessandro Zorat
			   (zorat_at_cs.unitn.it)