Do I need reservation for ferry from HK to Guangzhou in advance?

Hi I am arriving HKIA at 8:30am and would like to take the ferry to either Nansha port or Humen port. Please advise 1.) which port is closer to Panyu? 2.) Which ferry line has schedule for shortest transit time for my journey? 3.) Do I need to make reservation before hand or if I can book upon arrival?