Think of it this way... Have you seen a child prodigy play the Revolutionary Etude or FI the most?Definitely FI.
Played both and Revolutionary, I feel FI pretty simple to me. Doesn't take long too learn and make it musical if you use Goood practice techniques. Lots of people mindlessly play FI over and over again and think that would make it right. It doesn't.Revolutionary would take more work if you want to get it uptempo. Right now I'm working on that to reach Horowitz speed. And that requires a lot of patience and slow work. Especially focus on balance of the fingers and arms. Trust me it works.