Code Geass. I prefer it to Death Note because of how the story plays out. Death Note also just was a bit boring after l died and I didn't like how they acted afterwards. Mello and Near were okay and all but it just seems that Light wasn't all into besting them. He just wanted them dead so they didn't get in his way. Also,the animation,the plot and the main characters from Code Geass are better. There's a bit 更多 humor,less annoying characters and 总体, 整体 better plot structures.
If I had to choose Death Note. I like how it proved a series doesn't need a bunch of action 或者 blood for a series to be really exciting and keep 你 on the edge of your seat. I just loves the way Death Note bent my mind and really made me think. Though, I 爱情 Code Geass as well~
Plot wise, I prefer Death Note because I just 爱情 how mind bending it got at times. It was an 总体, 整体 joy to watch for me and it still remains my 最喜爱的 anime.
Character wise, I have to say I prefer Code Geass's. It's not that I dislike Death Note's characters, I really do 爱情 most of them, it's just that the Code Geass set of characters were 更多 interesting to me.