Frying pans are a lot more lightweight than sauté pans which makes them easier to carry around the kitchen, they also offer less surface area due to the sloped sides which means you won’t be able to use as many ingredients as you would in a sauté pan. Sauté pans tend to heat up very quickly but don't stay hot for long when taken off the heat, whereas frying pans are slower to heat up but take longer to cool down after cooking. Sauté pans also come with lids whereas frying pans do not. You can use the two different pans interchangeably for certain jobs in the kitchen as they’ll do a similar job however for other cooking techniques like braising using a frying pan in place of a sauté pan would be seen as a cooking faux pas.