My 2 cents worth - In 1st, 2nd and 3rd "Winning" Order
Q1 - NKS, Tharman, TKL
Q2 - Tharman, NKS, TKL
Q3 - NKS, Tharman, TKL
Can see the trend, so will stop. NKS very well spoken and presented himself very well. Able to think on his feet. Comes across as Presidential.
Tharman comes across as cocky and arrogant, probably due to innate PAP arrogance. Able to think on his feet. Still Presidential but does not come across as being likeable.
TKL the hopeless Ah Beng simply CMI. Definitely not Presidential material. Comes across as a 2nd floor Sim Lim camera salesman.