Davao Chatter here! di kasi alam kung South or North Cotabato ang pupuntahan mo.
NORTH COTABATO to ( Cotabato City) = Take this route: Liloan-Surigao-Butuan-Cagayan de Oro-Malaybalay-Valencia-BUDA(Bukidnon-Davao)-Digos-Kidpawan-Cotabato City.
Note: Malaybalay and Valencia is part of Bukidnon.
I am sure dating mo sa Surigao from liloan early morning. So Biyahe na to Davao then sleep over ka na rito. Then next day take the trip to Cotabato City (4 to 5 hours)
Surigao to Cagayan (3 to 4 hours)
Cagayan to Davao (6 plus hours)

If South Cotabato naman: take this route.
Liloan-Surigao-Butuan-Cagayan de Oro-Malaybalay-Valencia-BUDA(Bukidnon-Davao)-Digos-General Santos City-Marbel
DAVAO TO DIGOS = at least one hour.
DIGOS TO GENERAL SANTOS = 2 plus hours!

text me at 09165132662 if in case my iba kang info na puwede kong masagot. Good Luck sa trip and have a grand time. Sana naka tulong yung info!