To state the obvious:

There is alot of difference between having 100 5MB documents and 5M 100B documents.

If your test doesn't give performance differences, look at other parameters:
Using the file system is invaluable during testing, you can just look at your files.
OTOH, backing up millions of little files is a pain compared to backing up one database file.

One more question: Do you need any kind of concurrency?
This could also influence your decision one way or the other.

In reply to Re: BerkeleyDB vs. Linux file system by Jost
in thread BerkeleyDB vs. Linux file system by perrin

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