Between 2 rads of the same kind (ie both heatercores for example) you can compare em quite easily with size. Frontal surface size is a direct factor of heat power, and thickness is a factor of about 1/2x.
Try and look for Bill Adams articles on overclockers.com (he posts on these forums as well, under the nick 'unregistered') he's done pretty charts involving a lot of different rads.
What comes out is generally speaking, heatercores are more efficient.
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