3 strand seems to hold up better esp when dealing with rough surfaces.
i have a 8 k 27 foot boat and use 3/8 but i keep 1/2 on board too for storm stuff. you might want the same thing but up a step, use 1/2 for normal stuff and 5/8 or 3/4 for heavy weather.
you also need to realize that even you boat wont easily be able to break 3/8 but its chaff that gets you in the end. you might better off with 1/2 and spending the extra on chaff gear
3/8 breaking is around 4400
1/2 is 7500
new england ropes