Raid 0 for media or previews? Using DSLR footage with Avid codec Sequence for smart rendering

I am on a PC currently  using raid0 for media (4x 7200rp drives, read/write at 600) and exporting (no previews) to my sas 15k rpm (read/write about 180) previews/render drive.
I want to use avid codec for my sequence settings, will be doing smart rendering and exporting preview files for quicker exports.
My question, should I export to my raid0 since I will be exporting previews?  Or is it better to keep the same setup and just add an export drive?

Either would work but since the Media array is so much faster than the Render drive, the export times probably wont change much exporting to the Render drive.
Eric
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