I usually make them in accordance to the rest of the meal. It's kind of what makes potatoes so great. I don't really have a favourite as they're good in nearly any fashion.
Diced with skin on, then lightly boiled, then lightly pan-fried, and coarsely mashed with a bit of fresh cracked pepper, fresh green onion, and goat-cheese feta. Prefer yams to potatoes.
Mashed is my #1 but any potato is a good potato imo Love em Not sweet potatoes though Them shits is for the gays