The breast has the most protein and least fat. Pretty good amount of protein in dark meat too, so can't hurt to mix in some dark meat to go with the chicken breast and make it moister and more palatable.
Chicken Protein (g)
Chicken, breast, fried, battered (half) 34.78g
Chicken, breast, fried, not battered (half) 31.2g
Chicken, dark meat only, fried (3oz) 24.35g
Chicken, drumstick, fried 13.21g
Chicken, light meat only, fried, (3oz) 27.27g
Chicken, thigh, roasted 13.49g
Chicken, wing, fried, battered 9.74g
Chicken, meat only, stewed, (1 cup) 42.59g