In part it is going to depend on the size-depth of the raised planters and if they have bottoms or if they are like raised beds with no bottoms.
The concern in any kind of container is drainage. You don't want to use garden soil in any type of container-instead I would use something specifically labeled for container plants. Miracle grow makes a potting mix specifically for container vegetables which I would mix with a cheap potting soil.

Hi,
Please watch the (9) short video's on building raised beds,you don't need to go to the same expense I did,but you'll get great tips and answers to other questions

My soil is Aged Steer Manure,Decomposed Granite,Clay,Pumice,Leaf and Grass Compost

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Here is a link that might be useful: Raised Beds by Jon (see all 9 short videos ;-)

Mel's Mix, from Square Foot Gardening:

a mixture of
1/3 compost
1/3 peat moss
1/3 coarse vermiculite (no dirt needed)