I think Skateboarding is more popular.
Skateboarding is getting more and more popular everyday so the answer is today
Both - skateboarding is popular with children, and so too are skateboarding competitions.
Skateboarding is popular in most countries. That's why they have different contests for world-wide skaters. Skateboarding is most popular in the United States. Specifically, Skateboarding is most popular in California. California has many skateboading parks and lots of skateboarding stores. If you wanted to skateboard I would recommend California.
Skateboarding is NOT a sport.
definetly in California
Baseball is more popular.