The speed and temperature of the cooking, along with the liquid used, should help with your decision. Those slow-cooking recipes for sauces and liquid broths will benefit from a saute pan's depth and large surface. For those recipes that need meat grilled or seared at high heat, you might want to consider a frying pan. The sloped side of the skillet also makes it a great candidate for stir fry. But if you want to achieve the perfect finish for stir fry, a wok would be the best choice.