Oh man, I read that thread title and thought, "hoo-boy, here we go again!" Good to see a civil, level-headed discussion...
I am an SVS owner so my bias is established, but asking the question is really like saying "should I buy gold or platinum?" It's really hard to see how buying either would be a losing proposition - at this point I literally think I would look at the vendors themselves, and base my choice on which I like better there.
Pretty lame I suppose, but unless you can audition the sub you want in the listening environment you will have, there's just no way. It's like Hercules and the Hydra - for every bad thing written about either sub, two rave reviews pop up in its place.