I am in Shenzhen and want to go to Singapore and Kuala Lumpur, Malaysia. Which is the most cost-effective way?

It is very convenient to go to these two places first. There are as many flights between Kuala Lumpur and Singapore as there are buses, and the prices are not expensive.

Kuala Lumpur: Shenzhen Fly----Kuala Lumpur LCCT--Bus---Kuala Lumpur Sentral (train station)--MRT light rail to the city

Singapore: Kuala Lumpur Sentral---Bus---LCCT--- -AIR ASIA----Singapore Airport--MRT to the city

Departure: MRT----Singapore Airport---duty-free shopping---take off---

The reason why I came from Singapore is that there are a lot of duty-free shops in the three terminals of Singapore Airport, and you can go shopping. . .