In my opinion, they're both great in their own ways. The story of Xenoblade Chronicles 1 was classic and engaging, while Xenoblade Chronicles 2 has its own unique charm and depth.
One common theme is friendship. Just like in the game, fanfics often explore the deep bonds between the characters. For example, the relationship between Rex and his Blades is further developed in many fanfics.
The story length of Xenoblade Chronicles can vary depending on how much side content you explore. On average, it takes around 50 to 80 hours to complete the main story.
Well, the duration of the story in Xenoblade Chronicles 2 is quite substantial. If you just focus on the main quests, it might take you around 50 hours. But if you get into all the side quests and extras, it could easily push past 80 hours.