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The only place you will find RAM based SSD is attached to a server. It has to be powered constantly. All of the SSD's you will find in the portable/home marketspace will be flash based SSD.
My choice between the two would depend on how much data I would expect to write to the drive. For low data write, where you just read the drive most of the time (as in booting, loading apps) I would go the SSD version, but if I expected to write alot, capturing data from cameras, I would ge the HDD version. Flash memory wears out, you can only write to it a certain amount of times before it fails. Countermeasures include balancing writes over all parts of the drive, but if you are capturing a large amount of temporary data then you will wear out the small SSD drive pretty quick.
Edit: or you could do what Alex does, use the built in SSD drive for fast loading, and capture onto an external USB HDD
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