We've had great dinners at both. You didn't mention where you were staying, maybe chose the one that's easier to get to ?? If you pick the right time and have a table along the windows at Narcoossee's you can see some of the fireworks from MK !
Last time I was at Yachtsman (a Sat night in Oct 2015 during F&W) it was almost rowdy. Much louder than I expected. Food and service were great but more casual vibe than I expected.
We ate at Narcoossees on our last trip and I was very impressed. I had a unique summer salad that was so great I want to recreate it at home. It had pickled blackberries and cornbread croutons. DH's lobster bisque was out of this world. For entrees we had the scallops (me) and the filet (him) and split a side of brussels sprouts. This was all very good, but the real standout was the almond crusted cheesecake. The service was some of the most professional I've experienced at Disney and I was especially impressed at the waiter's attention to our two daughters. He made sure the meal pacing was to their liking as well as ours (bringing their entrees out right away with our apps). This was such a nice tough for us.
It's not really a fair comparison because I haven't been to Yachtsman in almost 3 years, and Narcoosees is so fresh in my mind. You can't go wrong with either but just wanted to add a positive review for Narcoossees.
We’re staying at POR so I think Yachtsman would be easier to get to (boat over to DS and catch a bus or Uber). We actually have an adr for Narcoossee’s on Thurs 10/18 at 7:30. I hadn’t realized you could see the fireworks from inside there. Maybe we will keep that one then. The fireworks will be the Hallowishes that night at 10:15. While I’m sure dinner will be over by then we can always hang out and view from somewhere else.
Yachtsman is GROSS!!! Go eat at a Denny's and you'll get better food not to mention the service is terrible.