So excited to see the big camelback now completed! It should certainly be one highlight of the ride.
Some comparison pictures:
(Picture of Helix by Oligao)
(Picture of Flash by gavin on CoasterForce)
Difficult to exactly tell since the camera angles aren't the same, but I think DC Rivals' got the tallest hill overall. Maybe it is slightly steeper too (which is even harder to judge). Of course height and steepness doesn't matter much if speed is lacking. But don't worry, coasterfans in Europe generally agree that Mack's latest coasters provide good, sustained airtime! As you may know, I've been on Alpina Blitz and Helix, and while I think the air isn't ridiculously insane as on El Toro and GeForce, it's very good nonetheless.
What makes DC Rivals' camelback very interesting is its unrivalled height by Mack standards. You may get a very, very sustained and decently strong airtime indeed ;)