Laravel difference between DB::raw and selectRaw

When I run the following code I correctly get the sum of points appended to the User model.

User::withCount([
    'points' => function ($q) {
        $q->select(DB::raw("SUM(points)"));
    },
])

But when I run the same query using $q->selectRaw("SUM(points)") instead, Laravel returns the count of rows, and not the sum. What gives?

Whats the difference between between DB::raw and selectRaw?

via Chebli Mohamed