26" Radiator

I am in the process of deciding which to get, and was wondering if you guys had any insight on the question on hand.
Would I be better off getting a three core radiator that uses 3 5/8" tubing or a 2 core one with 1" tubing....
Both are good radiators and not sure which to pick....

Thanks

ur putting this on a gen. 2 hemi, or a stock slant six ?