Try them both and see! The 4 ohm is generally the recommended one however for 6 ohm speakers. I like my Paradigm 100.2 6-ohm speakers on my McIntosh's 8 ohm tap.
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A 6 ohm rating is it's average. We don't know what it's extremes are to come up with that average. It may have some serious dips that could be hard on your amp using the 8 ohm. Do what Aball says and try both. One will likely sound better to you. If you don't hear much of a difference, then use the 4 ohm. Good Luck