It occurred to me that she was awful curious about the belt between rescuing Eragon and Arya and them finding the rest of their gear.
Later they go back to recover Wyrden's body but they couldn't find the belt.
You don't suppose Angela, perhaps with the Wercats' help nicked it first?
Saphira respects Nasuada a great deal. Nasuada grew up amongst the Varden and would've been shown to her egg.
Imagine the daughter (and successor) of the leader of the Varden being chosen as rider. Brom and Oromos could have trained her every bit as well as Eragon. She knew the Dwarves well, had connections to Orin and could've represented the alliance every bit as well as Eragon.
All things considered I think she would've been a better choice. I'd love to hear your thoughts though!