I am still looking into which one of these tools I should use. When I was poking around I noticed none of them really have any new releases:
Xinc
Version 2.0.1 released 02/05/08
Phing
Version 2.3.3 released 12/07/08
phpUnderControl
Version 0.4.4 released 08/09/08
Should I choose phpUnderControl because it had the latest release and development will probably be continued? I don't want to have to switch in half a year just because some feature that comes with php 5.3 can't be handled by one of them.
I would need PHP Unit, SVN and Codesniffer support.