Mechanically speaking, if the Honda is maintained exactly how the Porsche is maintained (ie accoding to manufacturers spec) , I would expect the Honda to last much longer, and go for many more miles w/o incident. Toyota and Honda simply have a very different way of building a car.
On the other hand, if you changed the oil and filter on a Honda every 15K like you are SUPPOSED to do on a Porsche (why would anyone do this BTW?), you might get a different result.
Interesting conjecture.
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