I would use the last one as although you're jumping away from the camera it shows a good fence to say that he happily jumps (ditches/trakehners) and also shows the horse's fabulous technique!!
another one for the 3rd, 2nd is nice as well but 1st doesnt show him off at all IMO....what about using no 3 and having a confirmation shot taken from the side as well....he looks really nice by the way.....