Getting 2/2s simply for playing Magic is a strong ability on its own, and opens up options for mana ramp, Voltron (making 1 creature super strong through powerups), Curses like Curse of Opulence for table politicking, and several other cool, unique effects that Auras can bring to the table as you build a token army
The choice of what the best cards in a format are is obviously always somewhat subjective, and it will come down to what a given player likes to play
Ceremonious Rejection can be sided into any deck that can reliably have one blue mana open by turn one or two, and it stops colorless spells cold
Of course, when the marquee general is as prolific as Breya, it ultimately means that the back-up generals are going to be a little less notable within the context of their product
She costs less because she triggers once a turn and can be attacked to be removed from the board
Sorry in advance!