I would go with Yachtsmen. Its a favorite of ours and the atmosphere is much quieter than Le Cellier. You will see kids in Yachtsmen but its just a completely different feel. At Le Cellier, its always so crowded, we have always had a very long wait and once in felt a bit rushed. The food is very good, I love their Mushroom Filet, but I know if I was doing a dinner alone with my dh, I'd pick Yachtsmen every time over any other two ts place in WDW.
My all time favorite server is there, his name is Thomas and he is just the best.
And for sure ask to sit by a window so you can see a bit of Illuminations. Its not like seeing Wishes from Cali Grill, but it adds a nice touch.
Enjoy wherever you go!