i have no personal experiance with either,but,whichever way you go get the one with the largest sq inch of frontage,i take that back,i recored a volvo semi rad that was a four pass system!,as for louvered fins,they do cool better,but are nothing new,ive seen them as far back as the 60's,and very well could go farther back than that,take a close look at the fins on the rad youve got,they better be louvered or someone got gyped!