Last year, I basically narrowed my search down to these two tires as well for first winter in my S4. Ultimately, I went with the PA4s.
My decision was due to the fact that I only really need to drive in town, so even during bad weather, these are more than capable of getting me home safely. Since we don't typically deal with massive amounts of snow here in ND (as opposed to more, say, hard-packed / scraped snow or patchy areas) I didn't need a "stud-less snow & ice" and went with the "winter performance" to retain some of that sporty feel during the cold months.
As this was my first AWD car and first dedicated winter tire setup, I don't have a lot to compare it to, but I can say it dealt with average winter driving conditions MUCH better than my old 4wd TrailBlazer did (on all-seasons). I was very happy with the PA4s last year and coincidentally, just swapped to my 18" OEM / PA4 setup yesterday... bring on the snow!
On a side note, I put some Nokian WRG3s on the wife's van last year and been running them year-round... very happy with those as well for what they are as an "all weather" tire. Capable in the snow and handle as well as the touring A/S tires they replaced (of course, it's a van, but whatever!)
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