Interesting how you perceive more the woody-dark aspect of Encre Noire and Sycomore. To many people, including myself, the fresh vetiver part dominates.
I don't know the relative price of frags in Brazil, but anyway, an excellent fresh vetiver is Tom Ford Grey Vetiver. Here, it is more expensive than Encre Noire, but much less expensive than Sycomore. The freshest of them all is ($$$) Malle Vetiver extraordinaire, but as the $$$ imply, it is much more expensive than Sycomore. I agree that Eau boisee is probably not too long lasting. But Guerlain has an excellent Vetiver - very good, though somehow it has this reputation of being for old people.