A mix - Roosters, Manly, Souths, no one.
It would be a far better result for the North Shore region if one of Sydney’s NRL teams had control of the area. They’re able to actively engage the area on a regular basis.
There’s going to be little reason for a North Shore kid with no ties to the Bears to start supporting a WA Bears team. Whereas if the North Shore was given over to one of the existing Sydney teams it’s an easier sell if they can see the team regularly and have them present in their area. It would feel more natural and more like theirs, instead of having people tell them they should be supporting a WA team they have no ties to.