Taken from an interview.
"As filmmakers, my brother and I, we love the genre," Anthony Russo said during a live panel at CCXP in Brazil this weekend. "The more good comic book movies there are the better, as far as we're concerned. So, we don't really look at it as competition. We think Zack Snyder is great and we hope the movie is fun and great and we enjoy it like everybody else."
There you have it folks. It's going to be fun. So stop comparing the two movies.