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Short stories tend to make better advertising freebies, especially if you can write one containing characters from one of your full length offerings. They are more likely to be read than anything else because they are easier to slip in soon after download.
If you look on Goodreads you'll see people with TBR lists thousands of books long. A full length free book will just join that queue and never be read. That would only be any use if your intention was to milk the "also read" system or bump up your "sales" figures to get near the top spot in some obscure genre. Both worth doing, but they won't lead to increased sales of your other books.
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