Yes, Butterick, McCall and Vogue are all part of the same company. I haven't had trouble with any of those. If you want to make a coat, look at McCall or Butterick or Simplicity or New Look. They all have some simple coats and very good step-by-step illustrations.
Commercial patterns are sized totally differently than store-bought clothing. I wear a size 6-8 in clothing from the store and a 12 in most commercial patterns. What you really need to look at is the "finished garment measurements" listed on the pattern pieces. They are usually found at the bust, waist and hip. If you don't see the waist or hip measurement on the front pieces, look on the back pieces. Remember that these are finished sizes. You want enough ease in them to move comfortably and not be skin-tight, especially for a jacket.
I also use the Pattern Review forum. There's a lot of good information there.