I like Black Butler more I think, but Death Note is really awesome too. I've never seen the other two, so I can't really judge. And the picture is really awesome.
definitely code geass. c.c, kallen, anya and shirley and lelouch rock! the rest of the cast are okay i guess XD. lol the only picture i can find with the five of them in it.
Out of the three,my favorite would have to be Code Geass. Though I don't care much for the second season R2, the series was quite interesting and unique. It makes it to number five on my favorite anime list and two of the characters (one male, the other female) both make it onto my favorite anime male and female list.
I also like Kuroshitsuji (Black Butler), although I prefer the manga. The anime adaptation was quite fun to watch except for the second season (Kuroshitsuji 2 or Black Butler 2) ending. One of the worst ways to end a series in my opinion. But overall, I enjoyed Kuroshitsuji. It makes it to number sex on my favorite anime list.
I have not seen Soul Hunter though I plan to watch it in the future. ^^