As far as resistance is concerned there is not much difference between single turn and multi-turn potentiometers.
However, in sigle turn its resistance can be adjusted within ≈330°, so it will be used for course adjustment.
On the other hand resistance of multi-turn (some types have 10 turns, some have evn 25 turns) can be adjusted within 10(25) turns and that allows you to adjust the desired resistance with very high prescision ..