Champion (CU526) or Spectra (CU526) Radiator?

Looking to buy a new radiator, for my '71 Dart GT, for more road trips next summer. The car has ~116,000 miles on it. It has a 318 (Cloyes double roller timing chain and gears ~1500 miles ago), console shifted A904, LD4B intake with 1406 carburetor (Lokar throttle and trans "kickdown" cables), dual exhaust (FlowMaster 40s using factory exhaust manifolds and 2 1/4" pipes), PS, manual front discs (SSBC kit), 3.23:1 sure-grip 8 3/4" rear end with P215-75R14 rear tires. Mopar Performance viscous fan kit ~10 years (5,000 miles) ago.

Both radiators are comparable in price. Which would you choose, and why?

Thanks for your input!