135% vs 150%
First it''s about the wind, and then it''s about the boat, and then the skipper and crew. From what you''ve said, I''d go with the 150 for your light wind and Catalina36, if you are sensible enough to take in the laundry when the wind gets over 13-15 knots and you are reaching.
The 150 should give you good off the wind performance and give you power to go to wind on a light airs day. If you need to reach or close reach, it would be adviseable to be carrying a 100% or 80% headsail to pull your Catalina windward in heavier air.