Hi,
I bought a cheaper radiator, 3 new radiators failed within a year. They kept leaking at the seams. After lots of coolant and being able to change a radiator nearly blindfolded.
I purchased one from B.C. Broncos, I think it's a 3 core triple pass and I LOVE IT.
I prefer coper due to the ease of repairability. If you get a puncture or leak on the road a decent radiator shop can repair it, not everyone can patch aluminum.
My 2 cents.
Good luck!