I checked out the Parfumo site briefly but wasn't impressed. I gather that the site is pretty new, but there's just not much there so far. Their fragrance directory is very limited. They do have a good start, but have a long way to go. Perhaps their German language edition is far more complete than their English one.
Fragrantica is impressive because they've done so much over the past few years, growing from nothing into a substantial website. I like it that they at least make an effort to keep their directory up to date and provide photos and info about fragrances, even if it is sometimes suspect. But their organization is scattershot and some of their reviewers are not very good. Many of the better reviews on Fragrantica were written by Basenotes members. I don't see a great deal of activity on their discussion boards. I also am not aware of their board/moderator situation, but Basenotes has its own quirks in those areas.
I have been and remain vocal about the state of Basenotes. In spite of that I still think it is the best resource for solid information, mainly because of its intelligent, knowledgeable, passionate members. Site management is poor and getting worse, and there doesn't appear to be much commitment to the future. A number of veteran members who were excellent contributors have been banned over the years or have left on their own, creating a significant brain drain. We have lost some tremendously valuable members over the past few years. At the same time, however, I see some of the newer members growing into formidable posters.
There's no reason a person shouldn't access many different perfume websites and participate in them. Of course most people have a limited amount of time they can spend online, and it's nice to have a "home" where you spend most of your time and feel like you're part of a community. There are a lot of problems with Basenotes, but it is the home of more serious, thoughtful, and enthusiastic members than the other sites. Unfortunately Basenotes also seems to attract more immature, insecure, and frivolous members than all the other perfume sites combined.
All sites have something to offer, and all have shortcomings. I hope that one day one of them will step up their game, get their stuff together, and assemble a truly comprehensive site with organized management, intelligent members, an extensive database, defintive reviews, and vibrant and informative boards.