Marinate Chicken: Pound chicken breasts to about 1/2 inch thickness. Place in a bowl and cover with buttermilk and 1/4 cup Frank's hot sauce. Mix well, cover with plastic wrap, and refrigerate for at least 3 hours, preferably overnight.
Make Pickles: Heat white vinegar, water, and kosher salt in a pot until salt dissolves and liquid bubbles. Slice cucumber about 1/4 inch thick on bias. Place cucumbers, dill sprigs, and peppercorns in a jar. Pour hot pickling liquid over and seal. Let pickle at room temperature for 3-4 hours or overnight.
Cook Bacon: Line a baking tray with parchment paper, lay bacon strips on it. Place in a cold oven set to 400°F (204°C). Bake for 15-20 minutes, flipping halfway, until desired crispiness.
Prepare Ranch Sauce: Mix 1/2 cup mayo, 1/4 cup sour cream, 4 tablespoons buttermilk, 1 tablespoon garlic powder, 2 tablespoons chopped dill, chopped parsley, salt, and pepper. Refrigerate until ready to use.
Prepare Blue Cheese Sauce: Combine 1/3 cup sour cream, 1/4 cup mayo, 3 tablespoons buttermilk, grated garlic clove, lemon zest and juice, and 1/2 cup crumbled blue cheese. Season lightly with salt and pepper. Refrigerate until ready.
Make Buffalo Sauce: Heat 1/2 cup Frank's hot sauce in a pan over medium heat. Gradually whisk in 5 tablespoons cold butter in small knobs, stirring constantly until sauce emulsifies and turns amber-orange. Keep warm.
Prepare Seasoning Flour: In a large bowl, whisk together 2/3 cup all-purpose flour, 1/2 cup rice flour, 1 tablespoon cayenne, 1 tablespoon paprika, 1 tablespoon garlic powder, and 1 tablespoon kosher salt.
Coat Chicken: Add about 5 tablespoons of buttermilk marinade to the seasoning flour and mix. Using a dry hand, dredge each chicken breast in the flour mixture, pressing to adhere well. Shake off excess flour.
Fry Chicken: Heat oil to 350°F (175°C). Fry chicken breasts for 7-10 minutes until golden crispy and internal temperature reaches 165°F (74°C). Drain on paper towels.
Toss Chicken in Buffalo Sauce: Place fried chicken in a large bowl, pour buffalo sauce over, and gently toss to coat evenly.
Toast Buns: Slice burger buns, spread with softened butter, and toast until golden brown.
Assemble Ranch Sandwich: Spread ranch sauce on bottom bun, add pickles and lettuce, top with buffalo chicken, smoked gouda, melted bacon, drizzle more ranch, and cap with top bun.
Assemble Blue Cheese Sandwich: Spread blue cheese sauce on bottom bun, add pickles and lettuce, top with buffalo chicken, smoked gouda, melted bacon, drizzle more blue cheese sauce, and cap with top bun.