My parents had a buried wire. Every year, it needed a repair. The tool to find the break was not expensive. But, it was a pain to discover it was broken because a dog had wandered off. Also, if a dog was 'fired up' and running full bore, the 'correction' only lasts as long as the dog is close to the wire. Once past, the wire also keeps the dog out!
The better system, though it does not have the potential range, are the radio transmitter once. As long as the collar gets a signal, no correction. So if the beast ventures too far, they get the 'clue' and continue to get it until they return to the 'safe zone'.
My neighbors have tried both. But they let the batteries die regularly so it does not do a lot of good.
My own method was that when they went out, I went with them and I used a training collar with a 3/4 mile range. They could run free until I decided enough was enough. I'd call a few times, if nothing I'd hit them with the tone, then increasing levels of correction if stubborn (Irish Setters) until they were back at my side.