TDS is sort of terrible now. Noah's opening standup monologue is okay, but he never really has great political insight but still talks a lot of politics. He also does a lot of black-centric pieces, which are fine but narrow the appeal of the show. He also does not have the pull to get the same caliber of guests, and his backups are often nobodies, like he has had a decent amount of broadway cast members on lately. WTF wants to hear what they have to say. I get that he is making the show his own, tapered to his own interests, but unfortunately that show is not nearly as good, insightful or funny as the last one. Not by even a third.
As for Fallon, he really put a fresh take on late night when he moved to the tonight show. The result was that everyone was forced to up their game which meant that you probably ended up with better content no matter who you were watching. I liked Fallon on Late Late and liked him initially on the Tonight Show, but his overpositivity after a while starts to ring hollow and fake. I get that as a mainstream voice he wants to be positive upbeat and not cynical, but no one thinks everyone and everything is the best ever. I have found myself going back to Kimmel at the 1130 slot.