Out of the rows i prefer the double underhand barbell row but utilize them all. I do the typical 4 or 5 sets of 10 to 12 one day a week. Its almost in a bodybuilding fashion but slightly different... I also prefer pull-ups over pulldowns because the simple fact i like gravity resistance allowing me to use the body as a whole by itself, having to create my own tightness but i do not neglect my pulldowns. I like them all utilize them all with same sets and reps; Although, i use these movements, its still movements used to still strengthen my core more so than the normal use which i know sounds weird lol but its a benefit for my core lifts.