in-ground allows you to use all your property or get the exact shape you want/need.. wireless is a little harder to control the shape of the containment area by using location of the transmitter and power level....much easier to install though.
my uncle had a dog that was Houdini. He put in a perimeter fences and it kept him in for 3 days. Then he fought the charge and jumped the fence and ran off. If your dog is stubborn you’re probably wasting your time and money