To me, after using melamine extensively early on, and after trying bamboo and metal in recent years, I prefer melamine. And in general I don’t like sticking plastic in my mouth. But I still prefer melamine.
Weight- metal is heaviest, bamboo is lightest. Melamine has a good weight and it doesn’t just fall out of my hand because it weighs.
Bamboo- handwashing airdrying them- they tend to develop mold after a while.
One other consideration, if you are the type who occasionally bite on your utensil by accident, bamboo probably won’t crack your teeth while the other two will.
Shapewise- I prefer those that slims slightly from the top, but not extensively like those Japanese metal chopsticks. That’s a personal preference.
