Hmm, you know even the universal ones or the ones that come with a blow dryer are "just right", not too big, not too small, but there is one that is "famous" in the curly hair community and it is this one.
It's called "Black Orchid Hair Diffuser". It's big, and it looks like this:
https://www.amazon.com/xtava-Black-O.../dp/B00VJ06PG8
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