Are PEEK implants easier to fixate onto the bone than silicone?

It really depends upon where you want the implant. We do a lot of implants in my office. These can be silicone and placed through a small incision. When put in the right place they fixate beautifully, and you cannot feel the edges. Other implants require customization and still have firm edges you can feel, much of the time. However, for certain application a custom implant is better. I'd focus on the outcome you want and let an experienced doctor help guide you how to get there.