The outside of the hips is no determination of what the inside of the pelvis is like. The advantages to having a VBAC versus a repeat c-section are numerous. The most obvious is that a c-section is major abdominal surgery and it requires a longer recovery period. It is also a higher risk for harm to mom and baby. Even though doctors may lead you to believe it is safe, which it usually is, it inherently has a greater risk just by the nature of it.
Babies generally do much better in a vaginal birth as well.
The natural squeezing as they pass through the birth canal rids themselves of mucus and fluids. This does not occur in a c-section and surgically delivered babies often have more difficulty with respiration at birth because of this. A c-section is a medical intervention while a VBAC is nature's way of delivering your baby the way it was naturally designed to. Despite the fact that one out of four babies are born surgically, does not make that the preferred option. And even if you should end up with w c-section after laboring for awhile, it is still better for your baby.