"Suspicious" would be a more prudent posture. While Stewart may have data that shows deterioration as the distance falls below 12", they will never show it.
Perhaps, if you have 12" and need the gain of a perfed solution, Stewart is the way to go. But if either is not present, perhaps the decision should go towards woven? Either way, don't expect the woven mongers to help make the case for perfed or vice versa.