I'm amazed at myself that I have no favorite choice for superman, I did for both SR and MoS.
I was heavily invested in both those films in casting wants and wishes. Not so much this time.
It's not that I don't care or anything, it's that I'm more concerned this time that the film itself is the best it can be, ie, the tone, the suit, the look, the score, etc etc. Get that right and we have a winner.
Get It wrong and it doesn't really matter whom is cast.
If the film turns out to be some awful joke filled comedy, the actor(s) will share in the blame.
( and for the record, I don't think it will be awful. far from it. It will probably be the best superman film we've seen since S:TM. And yes, I think it will be that good. )
Besides, Gunn has pretty much nailed castings in his previous films anyway, so whom is cast doesn't really concern me.
And to be honest, I'm more curious/excited about whom is cast as Lex than I am Clark.
Will we FINALLY get the Lex that most of us desperately want? I think so.