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The advice given on this site is based upon individual or quoted experience, yours may differ.
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They are for two entirely different sailing scenarios. I love gennikars or drifters but you cannot carry them above about 6knots and they do not trim as close to the wind. A 150 can be carried in as much wind as you have crew to handle 12-15 knots and point much higher. If I had a 135 and wanted a light air sail I would go with the Gennaker out of 1.5oz cloth, if I had a 110 I would go with a 150.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.