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The other issue is mounting - the 20x80 is 2.4 Klgs. and the 20x90 is 3.1 Kgs.
What mount have you got ? considering ? With the 80mm size bino you can use a tall 'heavy duty' camera mount but the 90mm size will require a larger Bogen / Manfrotto type mount that will be expensive.
I would go for the 80mm triplets myself and if you do want to go bigger at a later stage move to the 100mm size for a noticable light gathering increase.
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