Do more rows also cool better in a TJ that has been proven to cool best with a single row core?
You don't get it. The TJ radiator cools fine. It doesn't need better cooling.
id also add the kind of car does matter to a decent extent. The type of engine varies from car to car so does the design of the radiator and coolant hoses even type of coolant.
The plastic cracks eventually. Yup. It sucks. But it lasts normally 8-15 years. Perfectly fine with me. I haven't found one thread where the aftermarket outlives an OEM.
Honestly you should just google aftermarket vs OEM radiator Jeep TJ. Read the threads. Find me one where the OEM is worse than an aftermarket.
At this point I'm responding just because I'm bored.