Rico, I'm sure either sail would work, but looking at the Kayaksailor, the Hobie sail appears to be simpler, more accessable, larger and less expensive.

Another alternative is the Windpaddle. Here's a link with pics of Kepnutz using one:
viewtopic.php?f=32&t=10967Sailing is fun in its own right, but it can also add trolling speed and extend your range when fishing. Aloha Dan used to troll offshore with his Adventure and Sidekick before he switched to an AI. You can look up some of his early posts to get more insight on some of his techniques. As choochoo says, the sailing forum has lots of tips on rigging the sail.
With either sail, you would probably want Sidekicks while fishing and sailing so you can concentrate on the fishing rather than the sailing, especially if the the wind picks up suddenly. Here's a pic posted by Skymax (on the sailing forum) sailing his Revo with Sidekicks:

With a little practice, the Hobie sail is quick and easy to set up and take down while on the water; you can store it as shown here for unrestricted rod movement:

or just furl it in place if you prefer (this is a little more work but keeps the cockpit uncluttered):

With any sail, you need some sort of centerboard or bilgeboard in order to go upwind. This is essential to keep the boat from drifting sideways. On the Hobie your fins will do (Turbofins work best because they have more surface area), but for better performance you can add a daggerboard if you have an Adventure. Additionally, you will need a large (sailing) rudder if you don't already have one.
The problem you're going to run into with your other kayak using a sail is the lack of a provision for a board, so the sail will be essentially useless upwind unless you can fashion a "leeboard" to reduce the side-slip. You will need a good rudder to control any weather helm. For this reason, you'll notice Hobie doesn't make a sail available for its own non-Mirage kayaks. Realistically, you're better off concentrating your efforts on just one boat IMO, and your Adventure is very well suited for the job having the fins, daggerboard well, mast receiver and large rudder already in place or easily available. And for that, the Hobie sail would be hard to beat.
