I know next to nothing about it. I know that another name is agarswood and that I love it! (If you are interested in this note, you can read more about it here.)
Both Attar al Oudh and De la Forêt contain this note, but in very different ways.
Attar al Oudh is all about oud. In the bottle it is a musty but sweet wood, slightly herbal and medicinal. On skin the true oud note develops, it is musty and pungent, woody and nutty, deep and resinous and probably not a scent that everyone will love. As it dries, amber emerges and the drydown is a gorgeous oud/amber. This is a very simple scent, there are no surprises, nothing much happens... But if you love oud this is awesome!
De la Forêt is quite similar but a bit more complex. In the bottle this scent smells a lot like Attar al Oudh, but not as musty with more of a fresh forest character. On wet there is a flash of oud at first but then comes other exotic woods and a large dose of musk. This is a more delicate scent, not at all as musty and pungent as Attar al Oudh. The oud is still noticable but one of many notes rather than de dominant note. There are sweet notes of tonka and amber as well as sharper notes that I can´t quite place. This dries down to a gorgeous, but not very special, woody amber that at times morphs into something that smells much like fresh mushrooms. I get that mushroom note sometimes in various scents, I don´t know where it comes from, but I love it! My theory is that it´s a quirk of my skin, that turns some vanillas into this fungal note... There is no vanilla listed in the description of this scent, but it might still be there, so I´m not dismissing this theory quite yet...
Attar al Oudh has greater sillage than De la Forêt, but they both have about the same longevity, about six hours on me. I love both of these scents but perhaps not enough to get full size bottles. But I definitely want to experience more oud perfumes! Can you recommend any?