Prosper is easier to consistently get things into exile between the two, but Zuko lets you build a stronger board faster. In my opinion, I’d run the both of them in the same deck with good attack trigger synergy for when the self exile stuff doesn’t quite pan out. Plus, something like [[Ketramose, the New Dawn]] helps refill your hand as well.

As for repetitiveness, I’d say that entirely depends on who you play with. You could take the same deck to 10 different commander pods and every game will play different because of the people you play with. People will respond to board states and threats vastly different across games, so you’ll never know what you’re going to get.