A debate as old as time:
Plastic or metal pegs?
The Truth is, it depends on your riding styles.
While most current BMX bikes boast plastic pegs, many of the sport's OGs still ride metal.
When deciding, the first question you'll need to ask yourself is:
Where do you plan to ride?
If your answer is the skatepark, plastic pegs are probably the way to go. The PC compound will slide much more smoothly on coping and ledges than its metal counterpart, and do less damage to the spot. Another perk is the replaceability of the peg's sleeve. Peg worn out? You only need a new sleeve, not a full peg.
However, if you're planning to mostly hit the streets, maybe consider metal. Steel pegs have a longer lifespan, and are built to take all the abuse which comes with street riding. They may be heavier, but it's sometimes worth the tradeoff. Plus, there's nothing better than grinding a freshly waxed marble ledge on a set of steel pegs.
Once you've decided on plastic, you'll need to choose which core is best for you. Plastic pegs are available with either an aluminum or steel core. Steel cores will be more durable, while aluminum cores are lighter.
If weight is a priority, choose an aluminum-core plastic peg like the Cult Butter Lite or Sunday Seeley.
If you're more concerned with the peg's lifespan, choose a steel-core plastic peg like the original Cult Butter.