There is certainly more chaos and more randomness is Tsuro of the Seas than the original Tsuro.
Both have gorgeous boards and Calliope is to be commended for giving such quality treatment to both.
These are challenging and enjoyable cerebral tests of both strategy and tactics. Some, who don't like luck to play a significant role in a game's outcome, will favor Tsuro. Those with more positive feelings toward luck will doubtless likes Tsuro better.
Tsuro of the Seas was a kickstarter offering and those who purchased the game in that manner received 12 promotional tiles. Beginning later this month, those tiles will be available for purchase for new fans of the game.
For more about Calliope Games visit: http://www.calliopegames.com/
You might also check out their next offering, Roll For It which just ended on kickstarter: http://www.kickstarter.com/projects/781219801/roll-for-it?ref=live. It too looks like great fun and I will hope to review it here soon.