Well, I don't want to get a rootstock war started on here, but since you asked, I will just lay it our plain and simple. Between me and other family members, we have approximately 25 trees on B118, and over half of them have gone down in various windstorms - mostly in the 30 mph to 40 mph range, but one storm at one location was stronger than that last year and got three trees at once. However, other apples (and pears) in the vicinity were just fine.
Most of the B118s that haven't gone down are leaning, and there is not a single one that is solid in the ground. The only ones that aren't leaning yet are the ones that are still small. I'm in the process of bracing all of the remaining trees with T-posts and coated clothesline.
Another thing I'm doing on some of the most important locations is piling a huge amount of dirt around the base along with the bracing. The weight of the dirt itself helps, and I'm hoping that the trees make more roots above the B118 roots.
Most of my trees are on MM111, and they are as solid as a rock. I've never had a single anchoring problem with any of them. With what I've been through I wouldn't take a B118 tree if someone gave it to me and planted it for me. Best wishes.