I haven't used many Double Pass radiators, But did install one in a YJ Wrangler with a 6.0L/4L80E not long ago, It worked OK, I needed both radiator hose connection on the same side, That's the only reason to run a double pass radiator that I can think of.
Aluminum VS Copper/Brass radiator debate.......I don't care one bit!
Aluminum being BETTER at heat transfer is FALSE, Sure you can compare a New Aluminum Radiator to a 60's style Copper/Brass Radiator & the Aluminum one will win every time, But a modern well designed Copper/Brass will outperform a Aluminum Radiator, COST is the only reason Aluminum Radiators are so popular.
Griffin Radiators are about the WORST aftermarket radiator on the market! Most of them develop Core leaks after a few years, The author of the article raved on & on about Griffin
Cheap Champion Radiators are better....At holding Coolant anyway.
U.S. Radiator & Walker make some Excellent Copper/Brass radiators if your interested.