In the long run, which is better - chrome drain parts or plastic?

Plastic will usually last much longer than chrome, but you have to be careful because it can be affected by some harsh chemicals in drain cleaners.

Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.