I think the Europe version scales better than the US version.
You CAN exclude rules in Europe if it's too much for you, but you can't ADD rules to the US game.
Thus, you get the option of tactically scaling TtR Europe in a way that you can't with the US map. That makes for a much longer-lived game.
Personally I feel that Europe scales much better to two players (because the stations allow you to mooch off of the other player's connections at the cost of victory points).
I don't know if you strictly prefer card board versions of board games, but there is a Ticket to Ride package on Steam that will get you US, Europe, India, Asia, Switzerland , and the Ticket to Ride USA 1910 DLC for 15 Euros total.
Other than that, I highly advocate going to boardgamegeek.com where the world'd biggest collection of non-mustachians will proudly present their 400+ games collections. It's a huge database with tons of excellent info. You'll find cheat sheets, game variants, video tutorials, rules questions, tactical discussions, review and ALL sorts of things in there.
Happy hunting!