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I mis-typed before . The last DF should have been FF. Shan't bother editing it now.
I would have said it was a hard floor and recommended a FF sub, but I've just read another discussion in the forum where someone who appears to know what they're talking about said it really makes no difference.
I suppose it comes down to whether you think a FF is more vulnerable to damage or looks better/worse than a DF.
Also FF can have the direction of the driver moved more conveniently than the DF as rotating the DF will not move the direction of the driver. This is only really applicable when trying to find the best location for the sub when integrating into your setup and for room issues.