Miles,

> I only have a laptop here so I can't really benchmark properly.
> I'm hoping maybe someone else has, or just knows which would be faster
> under high traffic/quantity.

Well, it's really a difference between round-trip time vs. the time required 
to compute the join.   If your database is setup correctly, the 2nd should be 
faster.

However, it should be very easy to test ....

-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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