Native Evergreen Groundcover for under pines
I was thinking of planting either bearberry (Arctostaphylos uva-ursi) or American Wintergreen (Gaultheria procumbens) in the mulched/improved area underneath some pines. The area is shaded, but not densely so. A thin coating of good soil over dense clay or pure sand. One of the possible locations gets a lot of wind and occasionally salt.
Which of these plants would work better? Any other suggestions as to native ground covers that are evergreen or have berries? (I define native broadly...anything from Zone 6 of the East Coast of the United States would do.) Has to be low maintenance as it would get little aftercare.