Cloud cross dressing. I'm adding in my consideration of that things like your dialogue options with Corneo referencing Barret and such. All told I find the Wall Market scenario to be one of the most fun in FF. I don't know if I nominated this one (partly because I probably wouldn't have considered it side content), whereas I did nominate Cavern of the Stolen Fayth, but that was one of the ones I was deliberating about among several choices for a while. Given the option I'm going with Cloud. I don't even know what Sphere Break is. Is that from FFX or FFX-2? Anyway, I find Stolen Fayth pretty decent because it adds to Lulu's story, but FFVII is my favorite game, so this wasn't too hard a choice for me.