The choice between a carrier with a handle, shoulder strap, or both depends on your comfort and the size of your cat. A handle is convenient for short distances and quick trips, offering sturdy control. A shoulder strap is beneficial for longer walks, distributing the weight more evenly and allowing hands-free movement. Having both options provides flexibility in how you carry the carrier, adapting to different situations and personal preferences. Consider your cat's weight and your own physical comfort when deciding, ensuring ease of transport for both you and your pet.