Yes pretty much the same. In Seaford are probably less people on the beach.
Parking fee as well. Just let you Mrs park the car 100m in the side street.
There is also some coffee shops to keep her warm.
Still prefer Seaford because of the lesser people, Sand is softer and I have only 5 min to walk from home to get there!

Had a look at google maps. As the bay is bowing in this section Seaford seems the better place to go. It will be more onshore if ther is some W in it.
cs