Most of the time, I love the New 52 costumes more. But Nightwing is a total exception. I loved his black and blue so much more because a lot of the Bat-family is all red and black. So when I saw New 52 Nightwing I practically cringed. I was like "Why DC??" Not that I don't like New 52 version (I still think he's as awesome as ever), I just love the classic costume so much more.
I like Nightwing more in blue than in red. It gives him a good contrast to Red Hood, for one, and makes for good duality with Red Robin (Even though Tim has a truly awful name). Dick's also just too mellow to wear black and red.