xslt processers for Windows NT - recommendations ? which is the best ?

Hello,

If someone needed to run an XSLT processor on a Windows NT environment
what would you recommend? Also please, comment on each of the options
below.

MSXML 4.0 ?

.NET System.Xml.Xsl ? (Noticed that for .NET framework Redistributable
WinNT is okay but for the SDK its not.. any experts on this?)

Non Microsoft recommendations?

Let us know please. 
Thanks,

Abhi

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Abhishek Sanwal
HP - Houston Campus