In my opinion the hunter is an awesome coil. I use to run the 5x8 all the time. I loved the balance this coil gave. Plus it was close to the depth of the stock coil with great seperation.
With the nel this performance gap widens. Slightly more depth, along with a more depth capable vdi read out. For me i really notice the improved proportional audio. There almost seems to be more accurate volume levels. Or a wider range of volume, from loud surface finds to deep whispers. Making it easier to identify depth by sound. Important when the old coins may be a few inches deeper than those darn modern coins.
I have just started using the hunter again. As I had some back issues and could only swing the small coil the last month. I forgot how different it is. In a good way
My bottom line, get the nel. It has enough performance gap from the 5x8 to compliment it well. I now how two very useful coils. Dependant on the task. If I could only have one? I'd take the nel...