The 1400DD goes a couple of inches deeper than the stock coil and it is a great coild for the wide open spaces since you get all that extra coverage.
It is not a good coil to use in very trashy areas or where the terrain is uneven.
The one downside is ........ it is heavy! I wound up selling mine because of it and now
stick with the 6X9 DD as my "standard" coil.
PS: I never used the 1400 at the beach, but I would think the 6X9 would be better in the wet sand as it would see less mineralization.