What do you think the cost of sailing 15000 miles is in a catamaran vs an up to 60feet trawler

[Foilmagnet]

The setup in the Trawler will be single engine with a get home.
Speed max 9knots but trawling at 6 knots
Engine will hopefully be a gardner or lugger v6. Get home.... What ever there is in it
Full displacement hull.
size from 46 feet to max 60 in the trawler I know it is wish full thinking to find a v6 gardner in a 60feet trawler. Well in almost any boat from after 1998.
Age no more than 25 years of the trawler
The cat will be a sail cat. min 40 feet and max 47 feet.
Age no more than 20 years of the sailcat.

Both used in hmmm ready to sail shape. What ever that means.

 

[Foilmagnet]

I am not so much thinking in fuel cost but service and repair cost. I have a feeling from all i read and seen that a sailboat is way more expensive in the long run. But i am often wrong so why not now