I'll take The Shield over Nikki.
spoiler (click to show/hide)
But only if it's in 1080P.
Not only is the Shield not in HD, but it looks terrible upscaled, even to 720p. The sort of digitally added film grain the show frequently uses does not upscale well, at all.
Also, 4:3.
I love the show, but it wasn't made for HDTVs.