The extra rules of Europe only add confusion to new players. Also, blocking routes is more fun!
Sure, the US board is the simplest and most straight-forward of the TTR boards and with the 1910 expansion it is a really good game.
I'd recommend the Europe board to people from Europe that wants the familiarity of the known geography.
Also, the rule changes aren't that significant:
1. Tunnels, a bit confusing at first, but easily grasped
2. Ferries, very easy to explain
3. Stations, the most confusing of them IMO, but they can be ignored - just play without them.