As in, is there an opening time when you might get a better champ? No. All random. Just cross your fingers and open it. Just make sure you don't throw your device if you get a champ you don't like.
If you have someone you want in the current 5* basic you should open now. The longer you wait the bigger the roster and the less likely you will get who you want. Think PHC. Good luck trying to get SL there. If you are waiting for a newer champs then wait.
Comments
I'd say before they add Spider-Gwen. I wouldn't wish her to be anyone's first 5*
Antman is pretty good. His defense is worth it once you get him dupped.