Yeah in his own comics, wear the regular suit, just with the justice league have a upgraded suit. He does not need to wear it all the time. Just for justice league.
Even spiderman with better abilities than batman wears an upgrade at times, especially when with the avengers.
Being the smartest man in the room is ok for batman but than he should just be a commander in chief. They need to balance his role, to not diminish superman. Infact one of them should not be apart of the justice league.