I've ridden the versions in Orlando, Hollywood and Japan, and definitely the best of the three is the one in Universal Studios Osaka.
The only advantage to Islands of Adventure is the fact that the River Adventure is within Jurassic Park, instead of just an attraction within the Studio.
I voted Hollywood. The Orlando version is in disrepair. Plus, Hollywood's includes the Barbasol embryo can lying in a pool of mud as an Easter egg toward the end of the ride. Nice touch.