Galar!
The region has a beautifully intricate design with memorable, alluring cities! The landscape in terms of routes is quite underwhelming though. Kanto, by comparison, I find to be rather unappealing and uninteresting, and I dislike how the cities are all clustered together. Galar also feels much more similar to the United Kingdom than Kanto does to Japan. In terms of gym leaders, I'd say Galar gym leaders are a tad more colourful for me, though there are a lot of fabulous Kanto leaders such as Sabrina and Erica! In terms of Pokémon design, Kanto edges out Galar pretty easily! Not only did they introduce my all-time favourite Pokémon, but they created some truly majestic mons including Dragonair, Articuno, & Wigglytuff! Overall, I'd say that Galar is superior, though not by much!