Biergarten is my DH's standing request for all WDW trips. The buffet is not that much different between lunch and dinner. The Sauerbraten is only there at dinner, which I think is the main difference. They do have entertainment at lunch as well and it is the same show. We normally prefer doing lunch there as it is nice break during the day, BUT for Food and Wine the booths are much more crowded at night than during the day, so you might want to consider grazing throughout the day at the food booths and then doing a Biergarten dinner at night. We were wishing we had done that last year at food and wine instead of doing lunch at Biergarten and then doing the booths at night. Plus, we were so full after Biergarten, that we didn't feel like eating much else at Food and Wine until it got pretty late.