Hello Laurent, and welcome to the club.
As Mica and Susan have repeated many times, nobody ever built an Alembic on his own. A lot of folks talk about Rick Turner Alembics ( or Michael Dolan for another), and I think that is somewhat misleading; what that means to me, is simply that Turner was working at Alembic when that instrument was built and not that he built it all himself.
As far as Old Vs New, I am all for the new. They look better, have more options and quieter electronics, generally speaking. As far as I know the technique for building the instruments has not changed much, if at all
So, if you ask me, no, I would not say that old Alembics were superior to the new ( woods tend to sound better as they age, though, so It's never easy to compare a 30 year old instrument to a brand new one). I think they are comparable , but the new ones have more lamination and seem to use more spectacular woods than the old. I'm sure some folks will disagree with me, but for what it's worth, those are my 2 cents on it.
Valentino