1. I would prioritize Artist Point because I rank it as the best Character meal at Disney right now. We did them both Thanksgiving 2022, and WC breakfast last a few years ago now. WC ends up being just a BBQ meal with some antics. Artist Point gives you better quality food and a more upscale atmosphere. Our daughter, 7, and son, 9, both love the meet and greet. She loves being a princess with Snow White, he gets to be grumpy and goofy with the other two (and tell mom that is just like the evil queen.) Artist Point feels like you did something Disney, not just a meal.
2. Depends on where you are staying and what you want but generally I prefer the breakfast. We rank the BBQ as just ok while the breakfast is better than most; just not sure it is out of the way nice. For lunch, going to Wilderness Lodge in general is a nice break from Magic Kingdom so WC makes sense then. However, we prefer Geyser Point to WC for the relaxing break meal.