Originally Posted by
caide
I would suggest staying in Singapore for the whole 3 nights.
I agree on that. There is enough to see and do in SIN in 4d/3n. If you split 3 nights between the two cities is just adding stress. It takes about 3 to 5 hours (one-way) depending which way you choose to get from SIN to KL.
KL is a bit like the smaller sister city, so the things to see are much alike.