Allograft or Xenograft?

[Capstone_marker]

So I'm looking at dental implants and it was suggested I get some grafting done to help insure that the implants stay in place. The place I went to said they work with allografts. I discussed other potential options with them as I wasn't exactly comfortable with the idea of my grafts being made from cadaver. They said they would look into other options for me. They sent me an email stating that while they can offer xenografting, it has a increased risk of generating an immune response. They also stated that they wouldn't work with synthetic/artificial since it has a higher chance of fracturing.

Any thoughts or advice? While the idea of an allograft may make me a bit uneasy, I think I could put it aside if it means a better chance of the bone grafts succeeding.