As someone mentioned before, if the rudders were VERY easy to lock down, I like version 2. I have kids and the centerboard, while great for performance and handling, is too much for a younger sailor (hell, it's too much for many older sailors) and would eventually lead to a grounding and damage. The centerboard in an opti is easier because the boat is slower and there is only one. I think what makes a boat fun for kids - particularly those who are beginner to intermediate in skill - is forgiving handling. If it easily gets trapped irons or is quickly overpowered, I think many kids will be frustrated or scared away. That's the beauty of the Opti, or Hobie Wave, or Laser Radial.