I'd like to add Ticket to Ride to my collection of board games.

Questions I have specifically:

1) Which is actually better? Strategically I heard they were different and that Europe might have more depth to it (I forgot where I read this).

2) Which is easier/quicker to learn for adults? I want to start using this game to segue non-gamers into German boardgaming. (I detest Settlers so don't bring that up)

3) Is one particularly easier for kids to play and enjoy at a younger age? I have a kid who can currently only play Kids of Carcassonne with us... but which will be easier to learn as she gets older?

4) Any other comments would be much appreciated! :)

Thanks!