I think it boils down to pure and simple preference. But for the purist, X-tail is the way to go.
Personally I prefer V-tails.
Adding fuel to the fire...
X-tails are easier to transport than a one-piece V-tail. X-tails are simpler to trim. Good V-tails are harder to design.
My $0.02 Canadian.
-- Andrew E. Mileski Ottawa, Canada http://isoar.ca/
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