The ODay will give you better options on overnighting than the others.. and still be small enough to be responsive and a good learning platform.
If you feel strongly that this is for you, getting the Oday may simply let you avoid the first 'immediate' step-up after a season in a dinghy. The cruisability of the Oday over the daysailers will add to the experience.
The Hobie will provide a lot more rushes but will be somewhat more difficult to maneuver.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)