The lower one is made by a stamping process while the upper one is a weldment that is made of a 100 or more individual pieces soldered together. There s a large price difference as well as an efficiency difference for this reason. Also the top one is going to be more durable because of the amount of soldered connections and the end of each tube being greatly thicker. The top style is made the same way as a bar and plate intercooler, because it is strong and efficient albiet costly. The lower density of the bottom cooler means it wont cool as well but it will also have less of an efect on the cooling of anything behind it as it will allow more air pressure through to the cooler behind it. But you could always go with the top core and move it to the side and have greater efficiency on both coolers.
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