RE: 5 to 10 knots: what board?
I presume your 5-10 knots venue is flat water. It will depend on what is your largest sail and your weight. Serenity in one gliding only option for sure, the other I can see is Phantom 380 with a mix of gliding and planing and fully retractable daggerboard.
I don't think Apollo will be planing as of true 5 knots of wind, even with a jumbo sail...