Haven't heard of either of those before, but they both look like they would do what I mentioned in the other thread. StoGuard is not actually a vapor barrier according to their website -- it's a water/air barrier, but it's vapor permeable, which is perfect for your roof. You'd need furring strips or purlins over it to provide the ventilation/drainage space. Looks like Cedar Breather is an alternative to furring/purlin strips. I know there are other brands of that sort of drainage mat out there as well. I think you still want the air/water barrier underneath it (like StoGuard, Tyvek, building felt).
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