We have our sacrifice gravel paddock fenced in diamond-v mesh on cedar posts with a 2x6 top board. A small section of the paddock - right off the barn to which the stalls open directly - has two rows of the 2x6 boards at the top, as this area can be separated from the rest of the paddock, forming a corral. This allows us to restrict access to the greater part of the paddock in case of very inclement weather, while still giving the horses some turnout space, and we figured there would therefore be more pressure on this part of the fence.
Once in a while (not often, maybe a time or two annually), we spray a little weedkiller along the bottom of the fenceline. We keep the horses away from the area when we do this, and for some time afterwards. More often (still not that frequently) we use a string trimmer mower on the outside of the paddock fence.
We would do the same fence again. It was relatively expensive, but has been worth it, IMO.