copper or plastic

Always prefer working with copper

I really think copper with press fit couplings is the best option, and honestly, I wouldn't choose anything different.

Copper is better — stronger, lasts longer, and safer against leaks.

When considering pipework for bathroom refurbishments, both copper and plastic have their pros and cons in terms of quality, longevity, and leakproofing. Copper is known for its strength and longevity. It can last for decades if properly installed and maintained. - **Resistance to Corrosion**: Copper is resistant to corrosion, which makes it a reliable choice for water supply lines. - **Heat Resistance**: It can withstand high temperatures, making it suitable for both hot and cold water. Plastic pipes are more flexible, which can make installation easier and quicker, especially in tight spaces. Plastic does not corrode or scale, which can improve water flow and quality over time. Generally, plastic piping is less expensive to purchase and install compared to copper. Push-fit connections can speed up the installation process. However, plastic piping often has fewer joints, which can reduce potential leak points. Copper requires soldering connections, which can be a source of leaks if not done properly.

Both are same if the plumber fix the joint properly leakage is due to Joints are not properly fit but good if copper therre joints are going for leakage

I’d stick with copper too.

For quality longevity and future leak-proofing, both copper and PEX plastic pipework are viable, high-quality options, and often used in combination. The "best" choice depends on specific factors like your local water chemistry, budget, and preference for installation methods.

Copper offers the best longevity and proven quality, generally lasting 50-70+ years. However: Modern PEX (plastic) pipework with quality fittings is easier/quicker to install (meaning fewer joints and less labour cost), resists corrosion, and handles freezing better, offering a very long lifespan of 30-50 years and often considered the preferred choice for modern renovations for its lower cost and reliability against leaks caused by installation error or freezing. The quality of installation is the most critical factor for leak-proofing with both materials.