I think Disneyland Paris's Big Thunder Mountain Railroad is the best for a variety of reasons, but the most visually spectacular is its setting. Located in the center of the Rivers of the Far West, this E-Ticket races throughout the island in a wild and incredible journey through elaborate theming, mysterious mines, and dramatic geology. It is unlike any other Big Thunder, and its layout is a complete repackaging of the ride. The dramatic turnaround, for example, takes place in the first act rather than the final, and it is just one of many exciting moments on the ride. I'm so glad I was able to ride this when I visited last year. It made up for finding it closed for refurbishment the first time I visited Disneyland Paris nine years ago!