The one on the right (10/10): pros

• wireless
• does not require battery
• waterproof
• ergonomic fur
• self-replicating with the right settings
• unhackable

cons

• may run away from loud noises (use headphones)

The one on the left (4/10) pros

• if you lose it, you can buy a new one

cons

• not waterproof
• make clicky noises
• cable
• not ergonomic