I have been in a touch with a couple of surgeons to enhance my lower third.
Some recommend an orthognathic surgery. Others think it's too invasive and instead advise on a genioplasty with additional jaw implants to widen the jaw.
I'm very confused at the moment and asking for a second opinion.
Seems that you already had two opinions. That is because there are more than one way to take care of a problem. You need to discuss the pros and cons of each procedure with the surgeons you have seen and decide yourself if that method is for you. From the pictures you supplied one can not tell anything about the occlusion of your teeth but your face looks just fine to me and my third opinion is that you should not have anything done to it.
This depends a lot on your actual bite (how your teeth come together). If you have an over or an under bite the orthognathic (OMFS) surgery would be better. It is a larger surgery. The genioplasty (or potentially just a chin implant) and lateral jaw implants would be cosmetic only. Unlikely that orthognathic surgery would give you a widened jaw appearance. You would likely need those also. Hope this helps.
It is difficult to tell due to the beard, but you need to be more specific about what in the lower third of the face you are trying to accomplish. Then your surgeon can discuss each option in more detail.
If I have understood you correctly you are demanding a wider jaw with a squarish face. With beard on, difficult to judge but one question must be answered "do the teeth of your upper and lower jaws come in proper contact?" If no, treatment is different. If yes, you can have an extended chin implant. which will make your jaw look wider. If you don't like it, it can be removed and you don't lose anything. Both introduction and extraction of silicone implants are simple procedure with advantage of it being reversible.