Hi, I need to know the different of those train, and which one is better? Tks/Kristina

D is also called Hexiehao (Harmony) or bullet ones. The designed top speed is 250km/h. They have been widely used for serving fast and frequent transport between main cities, such as Beijing-Shanghai, Shanghai-Suzhou and Shenzhen-Guangzhou

G is Speed Electric Multiple Units (EMU) ones, which is the fastest running for long distance in China, the top speed of which could reach 350km/h.