Which one do you like?
Teenage Mutant Ninja Turtles: This I grew up with and loved the hell out of it. Leonardo was my Childhood Crush, I have fond memories of this show.
TMNT:2003: Oh holy hell did I enjoy this show OwO
I mean Jesus was it different! When I first saw it, I was AMAZED at how dark it was compared to the 80's toon, I then learned it was because it stuck closer to the original Comic. Still a great show, and could get pretty damn gruesome and even terrifying for the most part.