It depends on the dish. Different healthy fats will obviously impart different flavors, whereas most seed oils have had all flavor artificially removed from them (since most are rancid, and chemicals are added to make the rancid smell and taste go away). Still, it's amazing how much a healthy fat, salt, and pepper will go to flavoring a food, tasting far better than what you'd think, just going by fast food, or "the science".