Rick,
I haven't tried the whites coil but still use the 14 inch excellerator. Personally I don't see a reason to try the whites. Compared to the stock coil the 14 inch excellerator has better coverage , runs smoother,has better separation and gets a solid 3-4 inches deeper than the stock coil. Figured I could use the extra money for something I really need. I have seen on hear where the whites coil has had issues, and yes some of the excellrators have also, And there are some on here that won't put faith into anything but brand name replacement coils, to each his own but for me the 5 and 14 inch excellerators are awesome. As far as being sensitve to small items I have found BB's out in my front yard with the 14 inch excellerator. In the dirt I have dug 9-10 inch dimes, A measured depth (not the depth on the ID meter) And at the beaches in the sand the depth is crazy. I have used the big coil at several old homes sites in heavy trash and the separtion of the big coil still puts the stock to shame and is second to only the little 5 inch excellerator.
Ray