Q: what is the best way to use the minor fourth (iv) chord?
A: each person must decide which one they think is their favorite, or actually you don't have to decide, but you can if you want. and even if you do, i suspect you may hear another way later that you will think is your favorite at that time, but i can't stop you from trying to choose a favorite if you want to. but what i cannot do is pick your favorite