One benefit of the H18 is the availability of parts. A zillion of these boats were made and you can always find a part you need, either new or used, online and shipped to you in a few days. I'm finding that the parts for the Tiger take much more effort to find. Only a limited set can be found directly online, so you have to contact a dealer, who then has to contact Hobie directly, and the part numbers shown on the drawings don't match the US part numbers, so I've had to wait a few days just to find out if a part is available and the price.
1989 Hobie 18 Worlds boat
2007 Hobie Tiger