Place the potatoes in a large pot and cover with cold, salted water.
Bring to a boil and cook for 10 to 12 minutes, or until just fork tender. Avoid overcooking.
Drain immediately and toss the warm potatoes with the dill pickle juice, apple cider vinegar, and kosher salt. Let cool for 15 to 20 minutes.
In a large bowl, whisk together the mayonnaise, sour cream, Dijon mustard, remaining pickle juice, kosher salt, black pepper, celery seed, and garlic powder.
Add the cooled potatoes, chopped eggs, celery, red onion, dill pickles, and fresh dill.
Gently fold until everything is evenly coated.
Cover and refrigerate for at least 4 hours, but overnight is even better.
Before serving, taste and adjust with additional salt or another splash of pickle juice if needed.
Garnish with smoked paprika, fresh dill, or sliced eggs.