A 50cc scooter is often enough for short hotel-to-beach movement, central Agadir errands and easy city parking. A 125cc scooter usually makes more sense when you want extra comfort, more speed and better flexibility for mixed city and coast-road riding.
If your stay includes airport pickup, Taghazout day trips or more regular riding beyond the immediate hotel zone, the 125cc category is often the more practical balance between simplicity and range.