For one night, if the cost of the hotel and taxi to the ferry are lower with the Marriott option that would make sense just based on cost and you're still close to the Havensight area and town for the evening. But the BWEB or even the Island Beachcomber in Lindbergh are good choices to be a little closer to the ferry.

"Travel changes you. As you move through this life and this world you change things slightly, you leave marks behind, however small. And in return, life — and travel — leaves marks on you.”
-Anthony Bourdain