Unlike Disney or Cartoon Network, this one isn't even a contest in my book. Just about everything in Gen Y rangers from good to excellent. In terms of Gen Z, Korra and Ninja Turtles 2012 are solid, but that's all I can speak for. Spongebob and Fairly Oddparents went downhill in their later years. I've heard good things about The Loud House and Miraculous but haven't watched them and have never heard anyone mention the others even the few cartoon-focused Youtubers I watch occasionally. Whereas Cartoon Network and Disney have been considered to have really gotten back in the game with animated series since roughly the beginning of 2010 (only issue with CN is balancing their schedule due to the whole infamous time of letting Teen Titans Go be like 60+% of their airing schedule), I never hear anyone speak that enthusiastically about Nickelodeon anymore. Like they apparently get a good show here or there but their overall quality seems to not be on par with CN and Disney.