I have samples of both. Both are very good but I find them to be very different smelling aquatics. Erolfa is more pleasant-smelling to me, and I'd much rather have it in my collection. However, I think the Bulgari has more sillage and longevity.
I think of Erolfa to have more of a California coast feel (sunny & warm) and Bulgari to be like the BC / Northern coast (salty, cold, foggy).