65 vs 80 mm
Not as much as you might think, assuming, of course, equal quality of optics. I'd rate my Kowa 663 as within 5-10% of large Kowas ED, fluorite scopes I have used. There are times, of course, when that extra 5-10% is critical, but there are also times when it is probably overkill.
If you are target shooting at long distances, for instance, say 300 yards plus, you absolutely need all the performance you can get and that means as large a scope and as good a scope as you can afford and manage. On the other hand, for most birding, I've found that my Kowa 663 is all the scope I need and it does it with much less weight because I can also use a lighter tripod to support it. The 663 was a good choice for me because I can't manage the weight of a larger scope and tripod, especially now that I am getting older.
All in all, I'd say go with the larger scope if weight and size are not issues for you. Other than cost, those are the only negatives for the larger scopes.
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