I think you need to give a little more information than that.
What conditions are you sailing in?
What winds strength?
Do you want it for downwind speed or slalom racing on a short or lon cource etc?
What do you weigh?
What is your skill level?
What sails will you be using with each?
Do you like sailing with a larger fin for a given setup or a smaller fin?
Otherwise any info people may offer will be a bit vague.
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