Battery Usage
The Z2R series offers better battery efficiency compared to the Z3 series because the Z3 compresses the rope during operation, resulting in higher power consumption.

Transmission Ratio and Speed
The Z3 has a transmission ratio of 8:1, while the Z2-R has a ratio of 100:12 ≈ 8.33:1. This makes the Z3 slightly faster. It is recommended to use a high-torque drill for the Z3.

Usage Scenarios

Z2R: Simple and robust, suitable for transporting heavy loads over long distances. Unlocking the rope is more complicated, and releasing the load can cause a noticeable impact.
Z3: Precision-built and compact, ideal for lifting both people and objects. It offers smooth, impact-free operation, and stops immediately when released, similar to a descender. Perfect for frequent up-and-down movements, such as during water pipe installations.

Z3 Characteristics
The heavier the load, the more effort is required to securely hold the drill. If the load gets stuck during transport, the Z3 provides immediate feedback force (be cautious, as the Z3 may cause hand injuries, unlike the Z2R). Overloading may also result in the rope slipping.

Weaknesses of the Z3
The Z3 has lower battery efficiency and heats up faster. However, these drawbacks are only evident when compared to the Z2R. Without this comparison, they would not be noticeable.

Conclusion
These are different products with distinct advantages. The Z2R and Z3 will coexist in the market to meet various needs.