This app has the route planner capability, based on my prior routes instead of current locations. Its nice that it remembers your journeys, so if you go from the same station to the same destination frequently, you can just retrieve that route instead of searching again. But, we went somewhere new every day, so that was not helpful.
Plus Tube Map shows me the stations close by, instead of having to enter in the station by name, along with the map view that highlights the route and stations along the way.
And maybe I wasnt local enough to understand it, but I didnt follow the advice of which car to use for the exits - I was worried at first that maybe the door in the car wouldnt work or something, but not the case, all doors worked fine.