There is absolutely no reason to purchase Jenga World Tour over a copy of the physical game. The latter is cheaper, less painful on your eyes, and significantly more fun. The few changes that Jenga World Tour make to the overall formula are effectively pointless and in a few cases, serve to make the game overall less, not more, enjoyable.
Even the fact that Jenga World Tour is portable does little to justify purchasing a copy, as trying to play Jenga on the go isn't remotely enjoyable. If you've really got the hankering to play Jenga, get some friends together, pick up the $10 physical game, and leave Jenga World Tour on the shelf.