Good question, and here is my story.
I've used the Apple Watch Ultra for a month or more. At the beginning I liked it very much, the battery life and screen brightness are so different.
Then one day I feel I miss the iconic design by John Ive. When I wear the Apple Watch Ultra, I don't really feel it’s like Apple. You know, all previous watch faces are not optimized for AWU bigger screen, many black blanks left. It’s a strange bulky tool on my wrist.
Furthermore, I see no current band can fit the rugged style of the AWU, it can hardly go with my daily outfit. Everything is good when I switch back to SS S8, it looks and feels so elegant, iconic, something that I’ve loved for a long time. We really don’t need the design for the favorite watch, do we?
I also discovered that the titanium on AWU is not the same on Apple Watch Edition Titanium (S5 to S7), it's much easier to scratch and it's also impossible to buff out those scratches because AWU is matte finished. Those scratches look so shiny on the matte finish.
Not a second do I regret for SS S8.