we need more information about what you are cooling, what you're goals are (quiet, max OC, bling?...)
i would go w/ 2 rads
higher flow rates generally give a degree of two, not much more...
2 rads (in parallel to minimize head lose) are capable of dissipating nearly twice as much heat and should bring the coolant temp closer to ambient and give lower overall temps
it's all relative though - if you are going to use a huge heatercore that easily dissipate the system's heat then a 2nd HC will not give substantial improvements, in this case a 2nd pump is better
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