Ultraman Orb is the best phase two heisei era Ultraman series. This series has a simple and interesting story. The comedy and drama between the characters is also very good.
Another advantage of this series is that Ultraman Orb has many forms resulting from borrowing the power of other Ultramen. So Ultraman Orb was the first to introduce this ability, which was then continued by the next series, namely Ultraman Geed and Ultraman R/B.
Besides that, I like the main character, Kurenai Gai. He's a very charismatic and cool character, and that makes the series even more interesting. I also like the rivalry and strife between Gai and the main enemy in this series, Juggler, they are very opposite characters, and the rivalry of these two characters is one of the strengths of this series.
I think the weakness of this series is the character development of Gai, here the character is perfect. There are only a few episodes of Gai getting into some trouble. But despite all that, this series is already very good.