Baggy or oversized snow pants give you maximum room to move, which is why they're so popular with park and street snowboarders. The extra space lets you tweak grabs, shift your weight, and layer underneath without feeling restricted. They also allow more airflow, which can be nice on warmer days.
The trade-off is that all that extra fabric can work against you in certain conditions. Baggy pants catch wind on high-speed runs, drag in deep powder, and can snag on rails or other park features if you're not careful. They also won't trap heat as well, so they're not ideal for freezing days unless you layer heavily underneath.
If you're mostly hitting the park or riding in milder conditions and love the look, baggy pants are a solid choice. Just be mindful of the snag factor and maybe reach for a slimmer cut on deep powder days.