to zhang zhou, which is the best location from longyan or yong ding?

To Zhangzhou, it is suggested to go from LY. Between the two places, the bullet trains are available.
The bullet trains takes about 45 minutes and the ticket fare is around 32.5RMB per adult for second class seat and around 39.5RMB for the first class seat.
If you take the bus, you can take from Yongding or LY. From Yongding, the buses are at 06:30 and 14:50. From LY, the buses are at 08:00, 09:40, 11:30, 12:20, 12:40, 13:20, 13:40, 14:20, 15:20 and 17:00. The bus fare is around 40RMB and it takes about one hour and a half.