I don't want to jinx **** so I'm not saying who will have the most successful era.
However I think that Katy won't get such a big era like last time. I feel like Teenage Dream was her peak. Plus she's going dark this time around, doesn't sound really good either.
Gaga will do fine regardless, I feel that if the first single is something like Just Dance/Poker Face/Bad Romance or something like that, that she will do big number and have a successful era. I think that Gaga will have a bigger era than Katy.
Beyoncé has huge things lined up and I think we don't even know half of it. We'll see, I also think her era will be huge but I won't say if it will be bigger than Katy or Gaga because I don't want to jinx anything.
Nobody is here for Gaga anymore, so I believe it will be between Beyonce & Katy.
It will depend on Beyonce her Super Bowl performance tbh. If she can successfully pull it off, she might have her biggest era yet. Otherwise, Katy will rule.
Beyoncé and Gaga have the upper hand there. Katy will have some hits on the radio but won't sell as much as Beyoncé nor Gaga.