A relaxed fit jacket is a great match for freestyle snowboarding and park riding. The generous cut through the body and arms gives you maximum mobility, which makes a real difference when you're spinning, grabbing, or tweaking tricks. It's also the silhouette that dominates snowboard culture, so you'll fit right in style-wise.
The extra room means you can easily layer a hoodie or mid-layer underneath without feeling restricted, which is nice on colder days. Just keep in mind that all that extra fabric can let cold air and snow sneak in if the jacket is too loose, especially around the cuffs and hem.
If you prioritize freedom of movement and that classic snowboard look, relaxed fit is hard to beat. Just make sure it's not so baggy that it compromises your seal against the elements — and always try it on with the layers you'd typically wear underneath.