In fact, these two methods are quite troublesome to get to Taicang, and you have to change trains or something in the middle.

If you go to Suzhou North Railway Station, take a bus to Suzhou North Bus Station, and then take a bus to Taicang.

to Hongqiao station, transfer to the subway to Jiading, and then take the Shanghai-Taiyuan express to Taicang. Relatively speaking, I think it is a little more convenient to take Suzhou North Station.

Actually, you can take the high-speed train to Kunshan South Station, then take a bus to Kunshan Bus Station and then to Taicang, which is the most convenient way.