Choosing the best muffler packing material depends on several factors. Here's an overview including ceramic fiber:

1. Fiberglass: Effective for sound absorption and heat resistance, but may degrade over time with exposure to moisture and vibration.

2. Steel Wool: Offers good sound absorption and durability, but can rust over time.

3. Titanium Wool: Lightweight, durable, and resistant to corrosion, suitable for high-performance applications.

4. Silica: Known for its heat resistance and durability, suitable for extreme temperature environments.

5. Ceramic Fiber: Highly heat-resistant, lightweight, and offers good sound absorption. It's durable against vibrations and moisture, making it suitable for high-temperature exhaust systems.

6. Natural Materials (like basalt): Environmentally friendly and offer good acoustic properties, though they may not be as durable as synthetic options.

Choosing the best material depends on factors such as the vehicle type, desired sound attenuation, heat resistance requirements, and durability preferences for your specific application.