I have always been a Mercedes lover, but have owned a couple of Volvo's. I loved both of them. My 71 year old mother is on her 7th Volvo (92 740 Turbo Wagon-she drives WAY too fast), and won't drive anything else. They have been extremely reliable, comfortable, and have served well in 4 accidents. As far as electrical gremlins, no more than I have experienced with my 3 Benz or the previous SAAB. The Benz IS more comfortable, and does have a much more substantial feel. You won't go wrong either way. As everyone here knows...just make SURE it has records.
You'll do fine with either, but the three pointed star will always have more "arrival impact."