Not really. Brigitte has no way to bring her team back into the fight and cut down on spawn walks to point A. Her damage is lower and an aoe. If you’re just comparing shield gen with rally, then that’s just one aspect of the kit. Even then, shield gen has much more range and functions differently.
I honestly fail to see where Brigitte outclasses Symmetra. You just saying she does without providing any evidence to back your claim isn’t good enough.