I don't see how the transport would work with Stonebridge.
The nearest train station is a good 30 minute walk away and there's only two buses that go near their from town. With it being on the lancs that can easily be rectified I suppose.
Also, the traffic is horrific there at the best of times never mind with a footie stadium thrown into the mix.
With the docks you have no such issue. It's a 10 minute walk from the nearest station in a pretty derelict part of the city with easy potential for transport links with it being on the dock road.
but it's near a motorway lad, and motorway junctions never - ever - get chocker, especially not with 40,000 football fans trying to get onto them
the buses would be a nightmare - the distance means turnaround would be longer for a start
at the docks, you widen the road, and you have easy access to the exact same roads that are used to disperse from Goodison, except if you are clever then you widen the approach to the Wallasey tunnel as well and bang, traffic is gone