Honestly I think at least in terms of pure potential Androl and Pavara could beat any other channeler. If they had access to a Sa'Angreal and was in a full circle like Demandred had he could just open a gate way to the bottom of the sea they could have realistically held Tarwin's Gap for as long as needed. This is all assuming they'd be able to both control flows as they had before. She could defend any shields while he flooded the enemy with running water.