A nose heavy plane is very sluggish, making you feel you don't have enough elevator authority. A tail heavy plane will feel too responsive, making you think you have too much elevator throw. I tail heavy plane will also be difficult to trim (pitch). The nose will hunt. One moment you think you need a bit more nose down trim, the next moment you think you need more nose up trim.

A tail heavy plane is hard to land because of pitch sensitivity. A nose heavy plane is hard to land because you run out of elevator and the plane comes in like a rock.

Simply speaking,
Kurt