The Sincere Ltd TT has the blacken movement which the regular TT has normal coloured movement.
Since its Ltd, not many people has both, especially since they are so alike. I would believe that you will find spotted in Singapore more and the regular ones in the Western countries.
Difficult to compare price too since they are not widely sold together. I only have the Sincere TT and it retails very close to the classic Twist at around S$15K. The only thing is whether it can still be found at retail.