Turkey and chicken have very similar nutrient profiles, both being considered white meat (a.k.a healthy meat) and of the same general family of food.
Turkey is lower in cholesterol than most other meats, especially red meats (pork, beef, lamb, etc), and has a much better proportion of unsaturated fats to saturated fats than chicken. Per portion, turkey meat contains more protein per gram than beef, pork and chicken.
They are both nutritious and rich in protein, though chicken has more calories, fat and cholesterol. Turkey and chicken can be used interchangeably in recipes of salads, sandwiches, stews and casseroles. They can be baked, grilled or roasted.
Both chicken and turkey can be delicious and healthy ways to feel satiated while watching out your weight. When comparing apples to apples (or birds to birds), turkey may have the leg up over its fellow fowl.
Btw, turkey is the most common main dish of an American dinner, to the point where is sometimes colloquially called the “Turkey Day”.