I agree.. 'pasture' or cattle fence.. the 4x4 stuff is just not suitable for equines. I've personally seen horses put down with hoof injuries from pasture fencing.
None of the horse peple I know use vinyl fencing.. only 3 & 4 board PT or black ( cresote ). As for cribbing.. I'm sure your milage may vary.. however.. I've not seen problems with horses cribbing on pt or black boards, unless they border other pastures with horses in them. then there can be 'reach overs'.. but a hot wire stops that.
Soundguy