diesel vs gas

Good morning. Still on the hunt for a boat. I have always had gas engines before. I know them and the maintenance they require. What are the pro's and con's to having Diesel engines? I was looking at winterizing costs at it appears that marina's charge more money to winterize them. How...

After 10+ great years with a 330DA I am looking to move up to a 400DA. Two boats of interest local to me (Canada ... although certainly will look at fresh water US) ... one diesel the other gas. about $20K price difference. I was told by a broker that fuel usage per hour is similar for both...