+ 1Neither. Soda blasting with an experienced operator will do the job in less than 2 hours.
Soda blasting prices varies with the area. Also not every marina will allow it. Where I am there is a new dust-less process that will do the same thing, will not harm the gel coat and no need to tent the boat. In my case, to do it the long and hard way would cost at least $400 - $200 for the full face mask alone.
Another 500 will cover soda blasting. It will be healthier and money well spent because...
because of that!Scrape, Scrape, Scrape, and 80grit, to 250 grit... WEAR A MASK, WEAR GOGGLES, WEAR A chem suit!
It's messy as all heck, sanding is brutal.
By the way, NEVER again. Worst work I've ever done.