Keep in there's but 1 core in a radiator, but it can have 1-4 (maybe more) rows in it. And 3 rows won't necessarily cool better than 1 row. In fact the first TJs came with a 2-row radiator but it was soon replaced by the factory with a 1 row radiator with better cooling traits. All TJ radiators came with 1 row all aluminum cores after that, and so far no one has found a good replacement that cools as well or has the same quality and longevity.
oem would be the one to get if available. a one row with larger tube will out cool most two and three row ones.