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SG Patent Revocation vs. Non-Infringement Declaration, which one is "better"?

I have here an SG patent that disturbs my client and I am wondering what to recommend. The patent owner sits overseas, and the patent has a filing date of 2006. There are a number of parallel granted patents overseas, in the same patent family and claiming the same priority. The scope of protection of all these patents is very different.

Seeking a declaration of non-infringement is an uphill battle at High Court that comes with a lot of uncertainties. Before you even serve the writ on the patent owner you have to establish what the pa ... [read more]
But I can also start a high court case for non-infringement, and then commence invalidity proceedings with high court as part of my infringement defence, right?