Loc: Denton County
The standard hog panels are fine to keep hogs out, if you go to too high of panels you will have to cut down numerous areas for deer to jump in. Make sure make circular gives more support to panels with T post every 8 ft and tie off panels good. Pigs get crazy if get caught inside, I have seen them jump over 4 foot high panels when shooting at them. Cows are another subject.
Loc: East of Dallas
Hogs can just fairly well when frightened, but I would normally worry more about them going under your fence than over it. A standard panel will do just fine if well reinforced to keep them from squeezing under it.
I've seen feeder that are being dominated by hogs to the point deer stay away almost completely and regular hog panels were and still are plenty to keep the hogs out, I'd be more worried about them digging under if there are gaps than I would be them going over.
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