A lot of people use electric but IMHO start with electric, then slowly switch over to fencing with 8 " diameter 8 ' tall posts, set 5 ft above the ground, 3 ft. Below. You have to monitor electric fencing. I've never met a horse yet who didn't test a fence or gate. You are moving him to a solo situation. It could be that he was more herd sour than you know. Perhaps his buddies were bullies and he didn't want to stand too close.
I don't worry about my fencing coming down. It is metal 10 ft., 5 ft. Tall panels, bracketed on. I wanted the old metal welded but they cost a fortune. I saw 3 inch diameter pipes bracketed on and really liked that, too. Even 2 x 10 planks are good, too, but horses like to damage them by kicking, so you have to replace them as well. (They must be nailed/screwed on on the inside of the turnout so that your horse won't kick the plank straight off and jump what's left.) The big money TB broodmare farm nearby is always fixing parts of their 20 acres of wooden fencing every year. Still, it's safer than electric. Electric was never brought on the market to be permanent fencing. People have just gotten comfortable with that as their permanent fencing bc they've seen so much of it. I never saw any until easily into the 1990's. It's also cheaper and when you consider the work to put up ANY fencing, it's understandable.
Also, consider rolled horse fencing. I may have to put cattle fencing on the exteriors of my 4 acres of fencing bc our coyote problem has gone from bad to horrible. I can't keep cats bc they go hunting and become coyote chow. All of my panels are on the inside doing their jobs so what I put on the outsides will prevent critters running under and through my fencing, which they now do. I kept horses at another place for 14 years and I hated when pieces would break off and my horse would be wearing a piece of electric wire on the pastern. Good thing they were older and had been there, done that. I also lived through old falling apart cattle fencing with a strand of barbed wire on the top with very little harm, but I wouldn't recommend THAT for a horse.
If you drive around you can get the names of farms and call and ask them about THEIR fencing and how they like it.
Hope this helps. =D