I like carpet. Marine carpet grade carpet is really easy to clean. I have sprayed mine out at the car wash before - it is made to resist stains and to get drenched so don't hesitate to give it a good spraying. I think the Line-x stuff may be a little slick - but probably not too bad - it is made to be a little tacky when wet. I would be more concerned with how hot it would get on a summer day on the water.
What kind of boat is it?