Paul
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Raymond,
I believe Calibre and Assura are both very good tools and I can certify that UMC too delivers Assura rule files for their technologies. If one tool does not find errors found by the other, you shall not blame the tool! It means that the rule files written for both tools are not the same and that's a design kit issue, not a tool issue. As far as I know, many foundries indeed use Calibre for DRC verification, but it's their job to make the Assura rules correspond, such that you get the same DRC result when using Assura. This is mostly, but not always the case, so that you may have to play with the rule deck in some cases (this may even be true if you use Calibre...).
Regarding extraction, Assura xRC is superior to Calibre with respect to inductance extraction. For RC extraction, I guess they are comparable, but Assura back-annotation into a Cadence flow may be easier.
Hope this helps
Paul
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