Which Ship is Best?

A quick look at the Epheria Sailboat and Epheria Frigate in BDO.
Epheria Sailboat has:
5k Weight Capacity
1 Cannon per Side (Player Mounted)
1 Crew Member
Epheria Frigate has:
4k Weight Capacity
2 Cannons per Side (Player Mounted)
1 Crew Member
TL;DW
Sailboat for bartering. Frigate for sea monster hunting. Upgrade Sailboat to Caravel for better bartering. Frigate can stop at Improved Frigate if you don't want to make a Galleass.