Whisker vs Assym. Spin.
Roger, I've had both, plus full standard spinnakers. Full spinnakers require at least 1 or more knowledgeable crew (depending on boat size) to fly it while you handle the tiller and sheet(s). Not a good combination for either fun cruising or an inexperienced crew.Whisker poles are relatively simple, but add outboard weight to your jenny, an already heavier sail than an Assym. Spin.. This can work in medium and heavier winds but not well in light air. You may be referring to balance in the lateral context rather than fore and aft. I believe you will notice rolling as you progress downwind with a jenny and whisker pole vs the Assym. Spin.. This depends to a degree on crew experience, an experienced crew will relocate to help keep the boat in balance, otherwise you will have an uncomfortable ride. Eventually as wind increases, you will have to abandon the pole, not easy to do with a lot of pressure against the mast; then reduce sail.The Assymetrical Spinnaker or "Gennaker", a North Sails trademark I believe, is easy to launch and retrieve with a sock. I can do it myself with another person at the helm. This sail is easier to control downwind than either a full spinnaker or a wing & wing combination and can even get upwind in lighter conditions. It is also made of rip-stop nylon and is much lighter than any size jenny. I think it is the best way to go!Have fun!