Planning on undergoing a sliding genioplasty and getting a full jaw implant, should I combine these procedures?

Hello, I‘ve been planning on undergoing a sliding genioplasty and getting a full jaw implant and I‘ve been wondering if I should combine these two procedures or get them done separately. Obviously, combining them reduces the overall swelling bc I would only go under the knife once. However, a part of me is thinking, if I get the g.plasty first and then go for the implant, the overall result might be more predictable than when you combine multiple procedures into one big surgery.