Depends on what Saab(s) you own. The Saab Enthusiasts Club tends to cater for the older models only, and the Saab Owners Club for all the older models as well as newer models such as 9000,9-3,9-5,'new'900 and of course the 'classic' 900.
So, assuming you run a 9000 as you'ne posted on the 9000 pages I would recommend the Saab Owners Club. As to being worthwhile, like anything, you get out what you put in, but the club magazine is a resonable read, even if you don't get involved with anything else.
I would still consider the Saab Enthusiasts Club, as they cater for all Saabs no longer in production.
My old 9000 CS has already appeared in the mag last year, and my 9000 Carlsson will do soon. http://www.saabenthusiasts.co.uk
I'm in the SEC and the SOC - I think it's worth joining both.
KevMc 9000 Carslsson 2.3T