I cancelled a THR surgery along with many others I know. Do you realize the most large ball THRs are also MOM, so you might get a THR that has a lot of restrictions. Dr. Klug of Kaiser still does resurfacing in CA. I would look around before I let them change their mind at the last minute. Sounds like "bait and switch" Cancel and then think about getting more opinons and also deciding on what your really want. If I did not have a resurfacing, I would want a MOM THR. So there is still the same metal which very few people have problems with. It is the surgeons having problems with MOM because they are not placing components properly. Understand that they can place THR components incorrectly too and that can cause high metal ions.
It is all coming down to using the top experienced surgeons for either resurfacing or THRs. I would not let them pressure you in making a decision at the last minute. That is unfair and reflects poorly on the hospital, doctor and insurance company. I would not want to work with a surgeon that was so easily influenced by outside sources.
It is your choice, but when it is your hip and your health at risk - you need to make really good decisions that have taken time to research. I would never make a last minute decision about my hips - I only have 2 and I want them working properly.
Pat