Might be a long post but I just wanted to share some of my opinions about the series.
I had heard of CITY a few times but only in the context of it being a spiritual successor or even a sequel to Nichijou, but after watching them both for the first time back to back, I think that gives a bad impression of the show.
While CITY still has a very strong comedy and is still really exaggerated, it's definitely a more "relaxed" experience and even then its still very chaotic in places (episode 5 and 9 come to mind), however that definitely made me enjoy the show less since I was expecting more of Nichijou's fast paced and over the top comedy.
Episode 5 was the one that truly made me appreciate what the show was and made me go rewatch episodes 1 - 4 and made me enjoy them way more now that I wasn't comparing them, this also further reinforced one of my favorite aspects of the show which is just how interconnected the whole city feels and how this happens at just the right pace to avoid it feeling overwhelming.
The characters themselves were also really strong, there wasn't really a moment in the show that I felt bored while watching them, even the weakest one (shogi) was still entertaining. The "main trio" of Nagumo, Niikura and Wako all really grew on me even if they didn't make that strong of a first impression, my only real "problem" is that I wish Wako would've gotten more screentime
However Matsuri and Ecchan were the true stars of the show and had some of the most memorable moments, their first segment was the thing I liked the most during the first episode and every subsequent one was even better. The two frogs in a well and 500k yen scenes have been on repeat on my mind for days now which made their farewell in the finale hit that much harder.
I watched the whole show in short of 2 weeks, waching one episode a day and I feel like that made me appreciate the characters that much more, I doubt the finale would've felt as emotional if I had just binged it, however even in that small amount of time, I feel confident in saying that this has become one of my favorite shows OAT for a variety of reasons and I'm sure it will enter my rotation of stuff I rewatch every year.
There's way more things I really liked about the show (the musical ending, music, more stuff about the secondary characters, artstyle) but if I went in detail about everything then the post would be way longer, but I'd like to add that I'm really excited to start buying and reading the manga volumes after knowing they add way more to the story and characters.