We do plain top and bottom, two strand barb in the middle and outrigger electric.
The electric stops pushing and in most instances (not all) cattle breaking through, eg. bulls especially. Mind you calves will go through anything and especially at weaning. We find with weaning mesh (chook wire) small yard works for the first week while they quieten down and remember about electric.
Hmmm now it gets more complicated, the four strand is what we do for boundry fence, but some council (I think) laws say for road frontage, fences must be five strand barb. I like the plain top and bottom for the wildlife, I don't enjoy seeing animals caught on the fence or ripped by it.
And the five strand is only if it has to be replaced or initial fence, we've been able to fix ours and replace a strand.
Internally we do two strand electric with star pickets for our small paddocks, and they'll be cut smaller over time. This works well for us, mind you our cattle are so trained to go through gates to the next paddock they tell us when it's time at the moment.