All things being equal, I'd choose the Rock. Austin's greatest moments came in his rivalry with Vince McMahon, and try as they might, the Authority doesn't have near the charisma that McMahon did. Austin was a total baby in his heyday; he threw too many bitchfits behind-the-scenes and constantly refused to put talent over (Brock Lesnar, Scott Hall, HHH). He was more protected in the 90s than John Cena is today, and I feel like that would sour him to the smarkier audience. I won't say that Rock was more charismatic than Austin, but I feel like Rock would appeal more to casual and die-hard fans alike than Austin could. In 2015, at least.