The US style will almost always get better temperatures. Flow rates always help the block perform, and using a 1046 with 1/4" tubing will not help that. It can be optimized, as pHaestus points out, to do fairly well with low flow rates, but you won't get the best. Winding tube radiators are almost always worse than heater core style radiators.
This shows that. The Big Momma is a 6*6 heater core and beats the crap out of all the winding tube ones.
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The same holds true for the Swiftech gear: You can get MOST of its performance out of it at 3-4L/min, and it's possible to push 4 L/min through it using 3/8" ID hose, a GPU/nb block, and their MCP600. Why then would they bother with larger hose?
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Not everyone uses an MCP600. You're talking high end pumps, with tubing that is almost twice the size. It's not really relevant, I don't think.
German style setups take up less room and take less noise, for the smaller tubing and pump, but you'll lose a lot of performance, and their blocks look expensive. You also still have the PSU and the 120mm fan, so the silence is lost.