I am not sure how much land your brother has..... we have always used tight barbed wire fence with stays in it for cattle, but we were fencing sections, not a couple of acres. Cattle can move, bend and tear up panels (they are pretty hard on fencing) unless they are the really heavy duty kind that was mentioned. Cattle are notorious for rubbing on, leaning on, trying to get through, etc... fencing. Woven wire is traditionally sheep fencing and not made for big cattle.
I have seen smaller pastures also that had a strand of electric wire for fencing and it still amazes me that that keeps them in... I dont know how well that works on a long term basis, but unless someone wanted to do roundup every other day, it must work ok. Basicly for cattle, the heavier duty, the better.