Bells vs Museum Completion?

I always donate of course! I need to fill up the museum completely, its one of my goals.

Can always sell the next catch of that species.
 
In previous games, I would completely ignore the museum and just sell for bells. This time around, I am donating everything I get and selling all extras after.
 
I for the Museum because one may not know when one will get the next one.
 
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