How to take a bus to Houjie Dongguan from Shenzhen ? Futian or Luohu bus coach better?

Well, you can choose either of them. At both stations, many buses are scheduled to Houjie: at Luohu Station (CNY45), they leave from 07:25 to 21:00 every half an hour; at Futian Station (CNY40), they are in service between 07:00-19:00. The travel time is around 1.5h by the way.