I agree, Mike. Virgil is definitely more laid-back than Davenport is, and Virgil takes some very nontraditional "investigative approaches" that definitely fit your "quirky" description. And even though I've spent the majority of my life living in cities, my formative years were on a farm in the country, and I relate more to the the rural and small town settings of the Flowers novels than to the more urban settings of many Davenport novels. I'd also sometimes get annoyed, especially when Davenport was with Minneapolis police department or with state BCA, that Davenport and his "gang" of cops were not very different from the bad guys they were after, other than Davenport etc had badges.
But I've read and enjoyed every novel in each series. I even read a novel last month featuring Davenport's adopted daughter Letty as some US senator's liaison with Homeland Security; it was OK, but not great IMHO.
- GT