there's not much in the way of choice, unless you speak other languages (ie Italian http://rib.net/forum/showthread.php?s=&threadid=3477
For English speakers (readers!) there's only really a choice of two, RIB International
(the journal of BIBOA
- British Inflatable Boat Owners Association). Other mags have occasional RIB features - see http://www.rib.net/magazine.htm
and Sportsboat magazine now calls itself Sportsboat and RIB, but as former subscriber to I really don't rate it. It used to have so many spelling mistakes, typos, incorrectly annotated pictures and general mistakes that it was virtually unreadable. The highlight used to be when Paul Glatzel contributed. But then you can read Paul's input here (and here
Hope this helps!