Actually I realized something else about this change that makes it "better" than the original...
I think it is far more interesting if the son that is second in line, and will likely never be king, is kind, sincere, gentle and faithful.
While the one who, let's face it, is probably king at the end of the show/movie...is charming, not sincere.
Sort of like Faramir being able to release the ring, when Boromir couldn't...having the "lesser" brother be the "better" person makes both characters more interesting.
Imagine "Agony" sung where one brother is only after the chase, while the other is truly in love.
Baritone in search of a role in a new musical...