As someone already said , hooking tail on jig opposite keeps tail from getting stuck on hook, I do this because I sometime use different size hook in my jigs that I make and depending on way fish are hitting sometimes use a larger size . I've always hooked tail opposite and never even considered hooking it same side.
Also consider this, if you like using crappie nibbles or minnow tipped on after putting on the tail, you would HAVE to hook tail on opposite in order to add bait.