If you're spending most of your time hitting rails, jumps, and spinning in the terrain park, freestyle poles are worth the switch. They're intentionally shorter than standard poles, which keeps them out of the way when you're rotating or grabbing your skis. That shorter length also means less swing weight, making spins feel more natural.
Freestyle poles are also built to take a beating. Park skiing means lots of impacts, falls, and pole plants on hard surfaces, so durability is key. They typically feature smaller baskets too, which reduces the chance of catching on features or snow when you're mid-trick.
That said, if you only occasionally dip into the park and mostly cruise groomers or ski all-mountain, your regular poles will work fine. Freestyle poles aren't great for all-mountain skiing—the shorter length feels awkward on long runs, and you lose some of the balance and rhythm benefits that standard-length poles provide.