More info here:
I own it and the EdT (vintage) and EdP and love all three.
The parfum is not 'stronger' - what I mean is the sillage/projection is not more, however the longevity is very high. It bypasses the citric/fresh top notes and instead zooms right into the middle / base notes of woods, resins, vanilla, etc. That unique dusty aspect of the original scent is amplified in the extrait, so that the wearer is enveloped in a silky, soft, plush texture from beginning to end. I wear it very seldom in Summer / Spring preferring it in cooler weather, but that's just me. I also have realized that it wears a tiny bit different, depending upon whether it's dabbed on or sprayed on. I enjoy both applications.