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I think I'd go for the Ed30 but it's a very close call.
When the R32 first came out I was lent one and drove it back-to-back on exactly the same very varied route. In broad terms I found the R32's V6 was awesome but encouraged me into license losing territory - A Milltek would be an absolutely essential mod. Grip was excellent but the GTI felt lighter and more tactile to drive. This was before my GTI was so extensively modified.
I take the view that neither of the GTI/Ed30 and R32 is better than the other, but they are sister cars, each with their own merits.
I use the same route to test drive all the cars which merit it and it has been worked out for it's variety. I'll be testing a new V6 supercharged S4 on it next week and also the Mk6 GTI when it's available.