Strength is not the only factor that plays into female selection. Other factors play huge roles too.
In this case the man on the right is more attractive because he has clear bright skin, higher facial symmetry, intelligence behind the eyes, and is a single race (white).
The man on the left has mottled skin (signalling disease), dull uneven eyes, a facial expression indicating aggressive mental illness (which could harm offspring), and is clearly mixed race. As someone mentioned above, he has high Neanderthal and Middle Eastern admixture, which causes immune incompetency and mental illness.
He also doesn't actually have a wide jaw. you can clearly see his palate is very narrow and it's likely he only got to the size he's at through steroid use.
Bone structure (and jawline) is determined by diet.
If a woman had children with the man on the right and he was able to get her access to foods like liver, heart, kidney, bone stock, hard cheeses, caviar, etc. while she was pregnant, she would produce children that look like this: