My opinion...the sunfish sails more like a real boat. And it will go in the direction you want it to, within reason.
The Hobie is faster downwind or on a reach, but God help you if you have to go against the wind- then they are awful. I can never really get them to tack or go upwind. But they do have more room.
No disrepect meant here, but I gotta take exception to this. Hobies ARE real boats. They are more challenging to sail than the average monohull boat and require some extra skill set developement to sail efficiently. Once these skills are learned the boat is like any other boat, handling it comes naturally.
Besides being a blast to sail, Hobies are excellent teaching platforms. Take the H16 - While every H16 is identical, these boats are extremely adjustable. outhaul, downhaul, batten tension, jib tension, traveler, and mast rake all come into the tuning picture when setting the boat up for current conditions. Adding a full set of telltales lets student sailors see the effects of every adjustment and every input. Along with having alot of fun students who learn on Hobies, because they are more challenging, can step onto any monohull and sail it.
And again, no disrepect but I also disagree with these boats being awfull to sail upwind. In the right hands Hobies go to wind without issue. In many cases we can out point monohulls depending on conditions. And regardless, we will always beat them around the cans.